Robinson's time is 25 minutes and Wrong' time is 40 minutes.
Equation of Time:
x + y = 65 -------------------------- (1)
Total usage amount:
15x + 35y = 1775 -----------------------------(2)
There are several ways to answer this question. I will teach we how to create two equations from the given information. First we need to set some variables (or unknowns). we need to set up a sprinkler time variable for each household. Let's call the time of the Robinson family "x" and the time of the Wrong family "y". The total time used was 65, so the first formula is x + y = 65 ( Robinson's time plus Wrong's time gives total time).
Now,
We use the other hourly water information (remember we already have time variables for each family, x and y). We can set the following equation as 15x + 35y = 1775 (15 liters x the amount of time the Robinson's use water plus 35 liters x the amount of time the use water gives equal to total usage).
Now,
We can solve for one of the variables (x or y). It doesn't matter which one we start with. Also, it doesn't matter which formula you start with. I used
x + y=65 . On the other hand, subtracting x gives y = 65 - x.
Now,
Replace y in the other formula. 15x + 35y = 1775 turns into
15x + 35(65-x) = 1775.
Distribute 35 to each term in brackets. By isolating the x variable: x=25
Recall that x means how long the Robinson's have been using sprinklers.
Now,
We can plug x into the other equation: 25 + y = 65
Therefore,
Subtract 25 on the other side to isolate y: y= 40
Learn more about Minutes:
https://brainly.com/question/12175640
#SPJ4
I ONLY HAVE 30 MINUTES BEFORE I'M DEAD Question 8 (3 points)
(08.07 MC)
67,124 x three fourths = ________. Will the product of this equation be less than or greater than 67,124? Explain your reasoning. (3 points)
Your answer:
Question 9 (3 points)
(08.07 MC)
12,400 x one and one fifth = ________. Will the product of this equation be less than or greater than 12,400? Explain your reasoning. (3 points)
Your answer:
The product is less than 67,124 because the number 50,343 is less that the number 67,124.
The product is greater than 12,400 because the number 14,800 is greater than 12,400.
What is product?
A mathematical expression that specifies the objects to be multiplied, known as a factor, produces a product. For instance, the product of x and is c dot, and the product of 6 and 5 is 30.
First to multiply 67124 x 3/4
Here 67124 x 3 = 201372
⇒201372/4 = 50343
Hence, the product is less than 67,124 because the number 50,343 is less that the number 67,124.
Now to multiply 12,400 x 1 1/5
First to convert [tex]1\frac{1}{5}[/tex] into a fraction.
[tex]1\frac{1}{5} = \frac{5+1}{5} = \frac{6}{5}[/tex]
Now,
12,400 x 6/5 = 74,400/5 = 14800
Hence, the product is greater than 12,400 because the number 14,800 is greater than 12,400.
To know more about product, click on the link
https://brainly.com/question/10873737
#SPJ1
What is the number below the fraction bar called?
The number below the fraction bar is called the denominator .
In the question ,
it is asked about what is the below the bar part in a fraction called .
we know that the fraction has two parts ,
one above the bar and other below the bar .
the part above the bar is called numerator and
the part below the bar is called the denominator .
For Example ,
in the fraction 2/5 .
the number above the bar is 2 , So it will be the numerator and
the number below the bar is 5 , So, it will be the denominator .
Therefore , the number below is called the denominator .
Learn more about Fractions here
https://brainly.com/question/9135426
#SPJ4
What is the total pressure of a mixture of two gases?
The total pressure of a mixture of gases can be defined as the sum of the pressures of each individual gas: Ptotal=P1+P2+… +Pn. + P n . The partial pressure of an individual gas is equal to the total pressure multiplied by the mole fraction of that gas.
The total pressure of a mixture of two gases is the finalized value of the summation of the total pressure of each of the gases.
The total pressure of a mixture of two gases can be expressed in the form of an equation, as below,
Total Pressure = Pressure of Gas 1 + Pressure of Gas 2
It is noteworthy to be mentioned that the partial pressure of an individual gas is completely in contrast to that of the individual pressure of a gas. It can be expressed in the form of an equation, as below,
Partial Pressure = Total Pressure of Gas x Mole Fraction of Gas
Learn more about the total pressure here:
https://brainly.com/question/24054667
#SPJ4
The soccer field has a width of 6 meters. Its length is double the size of its width. What is the total area of the soccer field?
Answer: 72 meters
Step-by-step explanation: The formula for the area of a square is
Length x Width = Area. The width is 6. Double of six is 12. 12 x 6 =72.
suppose we draw one card from a standard deck. what is the probability that we get a queen or a king?
Answer: 2/13
Step-by-step explanation:
There are 4 queen (Q) & 4 king (K) cards in a standard deck of 52 cards . Therefore,required probability of drawing a queen or a king = P(QUK) = P(Q) + P(K) = 4/52 + 4/52 = 2/13 .
Pick a story problem that includes both integers − and .
Question 2 options:
A: One boxer gains 12 pounds of muscle to train for a fight, but another boxer loses 8 lbs.
B: I lost 12 of my pokemon cards, but found 8.
C: I ate 12 cookies, then I ate 8 more.
D: He road his bike 12 miles then another 8 miles
Answer:
B
Step-by-step explanation:
(50 points if right) Factor the expression.
36a + 42b - 18a + 6
ANSWER
The answer is 6(3a+7b+1)
PLS MARK AS BRAINLIEST
Anna says that the graphs of y=-3x + 7 and y = 3x - 7 are parallel lines. Do you agree?
Explain.
Answer: No
Step-by-step explanation:
Parallel lines have the same slope. However, the slopes of the lines with the given equations are -3 and 3, respectively.
Since the slopes are not the same, the lines are not parallel.
What is a root of 49?
The square root of the given expression√49 is equal to ±7.
As given in the question,
Given expression is equal to √49.
Let the square root of 49 be equal to the variable x we get,
x = √49
Write factors of 49 in form of prime numbers we get,
49 = 7 × 7
⇒ x = √ 7 × 7
⇒ x = √7²
Apply law of exponent ( mᵃ )ᵇ = mᵃᵇ we get,
here m = 7 , a = 2 and b = 1/2
⇒ x = ( 7² )^1/2
⇒ x = ( 7 )^( 2 × 1/2 )
⇒ x = ( 7 ) ¹
Any number raise to one is equal to number itself.
⇒ x = 7
Therefore, the square root of the given expression √49 is given by 7.
Learn more about square root here
brainly.com/question/3120622
#SPJ4
the frequency format hypothesis suggests that people are better able to work with information presented as frequencies than presented as probabilities. why might this be the case? multiple choice question human brains evolved to notice how often things occur, not how likely they are to occur. probability calculation is a more difficult cognitive task because it necessarily involves the manipulation of symbols. human brains evolved to process frequencies in the left hemisphere and probabilities in the right hemisphere. human brains evolved to process frequencies explicitly and probabilities implicitly.
Thus , option a)human brains evolved to notice how often things occur, not how likely they are to occur is correct
What does probability mean as a process?Probability theory deals with numerical representations of the likelihood that an event will occur or that a statement is true. The probability of an event is expressed as a number between 0 and 1, with 1 typically signifying certainty and 0 typically signifying impossibility.
Here,
According to the hypothesis of the frequency format, humans may process information more effectively when it is given as frequencies rather than probabilities. Possibly, this is the reason
Because human brains have evolved to perceive frequency rather than likelihood of events.
Thus , option a)human brains evolved to notice how often things occur, not how likely they are to occur is correct.
To know more about probability , visit
brainly.com/question/11234923
#SPJ4
please answer!!!!!!!!!!!
Answer:
- 1/2 × 8 = -4
-1/2 × -2 = 1
- 1/2 × 6/7 = - 3/7
B. -4 + 1 - 3/7x
D. -3-3/7x
factorise this expression as fully as possible:
4x²+x³
Answer:
x²(4+x)
Step-by-step explanation:
4x²+x³
Both of these terms have a common factor of x² :
x²(4+x)
This is our final answer
Hope this helped and have a good day
How do i solve this? A quadratic function has the solution \displaystyle x=3\pm2ix=3±2i . The function can be written in standard form as \displaystyle y=ax^{2}+bx+cy=ax
2
+bx+c . What are the values of a, b, and c?
The values of a, b and c if the root x = 3 ± 2i are 1, -6 and 13
How to determine the values of a, b and c?From the question, we have the following parameters that can be used in our computation:
x=3\pm2ix=3±2i
y = ax2 +bx+c
Rewrite the above expressions properly
So, we have the following representation
x = 3 ± 2i
y = ax² + bx + c
This means that
x₁ = 3 + 2i
x₂ = 3 - 2i
The quadratic equation is then calculated as
y = (x - x₁) * (x - x₂)
Substitute the known values in the above equation, so, we have the following representation
y = (x - (3 + 2i)) * (x - (3 - 2i))
This gives
y = ((x - 3) + 2i) * ((x - 3 - 2i)
Apply the difference of two squares
y = (x - 3)² + 4
Expand the bracket
y = x² - 6x + 9 + 4
Evaluate
y = x² - 6x + 13
Hence, the values of a, b and c are 1, -6 and 13
Read more about quadratic equations at
https://brainly.com/question/1214333
#SPJ1
Solve 64 = y^2 * please help
Answer:
y=-8 or y=8
Step-by-step explanation:
First you swap the sides of the question:
y^2=64
then you simplify the equation and take the square root of both sides of the equation and remember to use both positive and negative roots:
y= + 8 (make sure the "+" has the line under it that looks like this _)
Then you separate the solution and write the solutions, with a + sign and - sign, which gives you your solution:
y=-8
y=8
or
y1=-8 , y2=8
What is the volume of the sphere shown below?
--12-
A.1
B.
C.
D.
192 units3
576 units3
2304 units3
6912 units3
Volume of the sphere V is 2304π units³ when in the picture we have a sphere with radius 12 cm.
Given that,
In the picture we have a sphere with radius 12 cm.
We have to find what is the volume of the sphere of the picture.
We know that,
The volume of the sphere formula is V = 4/3πr³.
Here,
π is 3.14
r is 12
Volume of the sphere V = 4/3πr³
Volume of the sphere V = 4/3(π)(12)³
Volume of the sphere V = 4/3(π)(1728)
Volume of the sphere V = 2304π
Therefore, Volume of the sphere V is 2304π units³ when in the picture we have a sphere with radius 12 cm.
To learn more about sphere visit: https://brainly.com/question/9994313
#SPJ1
In the number 2,222. 222, how does the 2 in the hundreds place compare to the 2 in the place to its left?.
Answer:
2,000 vs 200 is a big difference, the main reason being that ten 200s is equal to one 2000
Step-by-step explanation:
Students in middle school and high school were surveyed about whether they are planning to attend college. The survey results are shown in the two-way frequency table. Does the data show an association between age and a plan to attend college?
Answer:q
Step-by-step explanation: If you want an answer you have to give us the data
Write this equation in standard form using integers.
y = 7/3x+25/3
10. Find the value of x.
(5x+12)°
O 10
015
20
025
(3x+8)
(25 points)
Answer:
(c) 20
Step-by-step explanation:
You want to find x, given that the external angle adjacent to a base angle of an isosceles triangle is (5x +12)°, and the other base angle is marked (3x +8)°.
Base anglesThe base angles of an isosceles triangle are congruent, so the other base angle is congruent to the marked base angle.
The external angle and the adjacent base angle are a linear pair, hence supplementary.
(5x +12)° +(3x +8)° = 180°
8x +20 = 180 . . . . . . . divide by °, collect terms
8x = 160 . . . . . . subtract 20
x = 20 . . . . . divide by 8
Using the Distributive Property, Solve the Problem below:
-2.5(4x - 4) = -6
(After using the Distributive Property, Solve for x)
The value of x in the expression -2.5(4x - 4) = - 6 is 4/3.
What are the basic properties of arithmetic laws of operations?There are three types of basic arithmetic laws of operation.
Commutative law for addition and multiplication states,
a + b = b + a.
a×b = b×a.
Distributive law states,
a(b ± c) = ab ± ac.
Associative law states,
a + (b + c) = (a + b) + c.
Given, -2.5(4x - 4) = - 6.
∴ - 2.5(4x) - 2.5(-4) = - 5.
- 12x + 10 = - 6.
- 12x = - 16.
12x = 16.
x = 16/12.
x = 4/3.
learn more about distribute property here :
https://brainly.com/question/5637942
#SPJ1
A bush is 180 cm high.
In a year, the height increases by 15%
Work out the new height after the increase.
The new height after the increase is 207cm
What is percentage increase?Percentage increase is the difference between the final value and the initial value, expressed in the form of a percentage. To calculate the percentage we need to have the initial value and the increased (new) value. In other words, we can say that percentage increase is a measure of percent change which gives the extent to which a quantity gains magnitude.
therefore %increase =( final value- initial value)/initial value ×100
let the final height of bush be x
15= (x-180)/180 ×100
2700= 100x-18000
collect like terms
2700+18000=100x
100x= 20700
divide both sides by 100
x= 20700/100
x= 207cm
therefore the new height of the bush is 207cm
learn more about percentage increase from
https://brainly.com/question/11360390
#SPJ1
Solve the following
2(x+3)=x-4
Answer:
x = - 10
Step-by-step explanation:
2(x + 3) = x - 4 ← distribute parenthesis on left side
2x + 6 = x - 4 ( subtract x from both sides )
x + 6 = - 4 ( subtract 6 from both sides )
x = - 10
Answer:
-10
Step-by-step explanation:
2(x+3)=x-4
2x+6=x-4
2x-x=(-4)-6
x=-10
Hence the answer is -10
In the diagram, rectangle ABCD is split in half by AC. What is the value of tan x?
A. 3/4
B. 4/5
C. 3/5
D. 5/4
E. 4/3
Answer:
E
Step-by-step explanation:
Since rectangle have 90 degree angles, Angle D is a 90 degree angle.
Side CD is 3
AD is 4
We found both of those using the definition of rectangle.
[tex] \tan(x) = \frac{opp}{adj} [/tex]
[tex] \tan(x) = \frac{4}{3} [/tex]
E is correct
which function in the random library will generate a random integer from 0 to the parameter value inclusive?
The function in the random library that generate a random integer from 0 to the parameter value inclusive is random.randint() function
What is a function?Functions are another key idea in programming because they let you put a piece of code that performs a specific purpose inside a specified block and then call that code whenever you need it with a single, brief command rather than repeatedly typing the same code.
What are parts of a function in coding?Code units that are "self contained" and carry out a particular purpose are called functions. Typically, functions "take in," "process," and "return" data and results. Once a function has been developed, it may be utilized countless times.
From the above definition, we get that
The function in the random library will generate a random integer from 0 to the parameter value inclusive is random.randint() function
To learn more about function, click the following link:-
https://brainly.com/question/22340031
#SPJ4
Write the equation of the line in fully simplified slope-intercept form.
11
1998 6543 N
10
2
1
-12-11-10-9-8-7-6-5-4-3-2-11
~
-2
3
-4
-6
-9
-10
-11
-12
1 2 3 4 5 6 7 8 9 10 11 12
Answer:
Step-by-step explanation:
o find the vertex of f(x)=x2−8x+7 , there are several things you can do. You could complete the square to get the equation into vertex ...
What was the Catholic Church's response to the Protestant Reformation?
They held a series of meetings to clarify the teachings of the Catholic Church
War between the Catholic Church and the Italian states
They accepted the viewpoints of other religious leaders
They encouraged more people to challenge the rulings of the Pope
Answer:The Council of Trent
Step-by-step: explanationwas the formal Roman Catholic reply to the doctrinal challenges of the Protestant Reformation. It served to define Catholic doctrine and made sweeping decrees on self-reform, helping to revitalize the Roman Catholic Church in the face of Protestant expansion.
:
I need help please :)
The graph of the linear equation can be seen at the end, and:
a) f(-4) = 1
b) f(5) = -8
c) f(0) = -3
d) you need to circle the points (-3, 0) and (-10, 7)
How to evaluate the linear function?Here we have the following linear function:
f(x) = -x - 3
We want to graph that line, but first let's evaluate as it asks in the steps below.
To evaluate the function, we only need to replace the variable x by the correspondent number.
a) f(-4)
Here just replace the variable x by the number -4, you will get:
f(-4) = -(-4) - 3
f(-4) = 4 - 3
f(-4) = 1
b) Here we will do the same thing:
f(5) = -5 - 3
c) f(0) = -0 - 3
f(0) = -3
d) To see which points are in the line, just replace the values of the point in the given equation. If the equation remains true, then the point is on the line.
For example, the first one (-3, 0) will give:
0 = -(-3) - 3
0 = 3 - 3
0 = 0
That equation is true, so the point is on the line.
The point (-10, 7) is also on the line:
7 = -(-10) - 3
7 = 10 - 3
7 = 7
Finally, let's do the graph.
Now you know that (-10, 7) and (-3, 0) are points on the line, you can graph these in the coordinate axis and connect them with a line.
the graph of the linear equation can be seen in the image below.
Learn more about linear equations:
https://brainly.com/question/4074386
#SPJ1
Jimmy eats 116 apples in 88 days each how many did jimmy eat
116x88
Answer:
10208
Step-by-step explanation:
116x88=10208
find the second smallest positive integer that gives a remainder of $2$ when divided by $3$ and gives a remainder of $3$ when divided by $7$.
The second-smallest positive integer that, when divided by 3, leaves a remainder of 2, and when divided by 7, leaves a remainder of 3 is 38
Given that,
We have to find the second-smallest positive number that, when divided by 3, leaves a remainder of 2, and when divided by 7, leaves a remainder of 3.
We know that,
We get equations as
N = 3a + 2
N = 7b + 3
Subtracting these equations we have that
3a - 7b - 1 = 0
3a - 7b = 1
So,
a=12 and b=5
The second integer we get is 38
Therefore, the second-smallest positive number that, when divided by 3, leaves a remainder of 2, and when divided by 7, leaves a remainder of 3 is 38
To learn more about integer visit: https://brainly.com/question/15276410
#SPJ4
which of the following is an example of stratified sampling? in order to assess students' satisfaction with the food establishment on campus, the first 50 students who came out of the student center were interviewed. the human resources department of a large bank wanted to assess the job satisfaction of the bank's workers. the department chose four of the bank's branches at random and used all of the workers in those four branches as the subjects for the study. a sample of 351 people called a radio show to express their opinions about the verdict in a murder trial. a health educator wanted to study the sleeping habits of the undergraduate students in her university. for her study, the researcher chose a simple random sample of size 150 from each of the classes (150 freshmen, 150 sophomores, 150 juniors, and 150 seniors) for a total of 600 sampled students. a poll asked a random sample of 1,112 adults whether they believe that the use of marijuana for medical reasons should be legalized.
The example of stratified sampling is a health educator wanted to study the sleeping habits of the undergraduate students in her study.
For her study, the researcher chose a simple random sample of size 150 from each of the classes (150 freshmen, 150 sophomores, 150 juniors, and 150 seniors) for a total of 600 sampled students. a poll asked a random sample of 1,112 adults whether they believe that the use of marijuana for medical reasons should be legalized.
Sampling:
In statistics, quality assurance, and research methodologies, sampling is the selection of a subset of individuals (statistical sample) from a statistical population in order to estimate characteristics of the population as a whole. A statistician tries to collect a representative sample of the population in question. Sampling is less costly than measuring the entire population, provides faster data collection, and can provide insight when the entire population cannot be measured.
Stratified Sampling:
When the population embraces a number of distinct categories, the frame can be organized by these categories into separate "strata." Each stratum is then sampled as an independent sub-population, out of which individual elements can be randomly selected. The ratio of the size of this random selection (or sample) to the size of the population is called a sampling fraction. There are several potential benefits to stratified sampling.
There are, however, some potential drawbacks to using stratified sampling.
First, identifying strata and implementing such an approach can increase the cost and complexity of sample selection, as well as leading to increased complexity of population estimates.
Second, when examining multiple criteria, stratifying variables may be related to some, but not to others, further complicating the design, and potentially reducing the utility of the strata.
Finally, in some cases (such as designs with a large number of strata, or those with a specified minimum sample size per group), stratified sampling can potentially require a larger sample than would other methods (although in most cases, the required sample size would be no larger than would be required for simple random sampling).
Learn more about Stratified Sampling:
https://brainly.com/question/20544692
#SPJ4