Recall that we are given the numbers 2*7 and 7*2. By a fact, we have that
[tex]7\cdot2\text{ =2}\cdot7[/tex]Note that in both cases, we are multiplying numbers 2 and 7, but what is changed it the order in which we do so. On the expression on the left we are multiplying 7 times 2, and on the expression on the expression on the right we are multiplying 2 times 7. This two expressions are equal due to the conmutative property of the multiplication of integers.
Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test). Find the probability that 2 - a randomly selected adult has an IQ between 100 and 120?
ANSWER
[tex]\begin{equation*} 0.40824 \end{equation*}[/tex]EXPLANATION
We want to find the probability that a randomly selected adult has an IQ between 100 and 120.
To do this, first, we have to find the z-score for 100 and 120 using the formula:
[tex]z=\frac{x-\mu}{\sigma}[/tex]where x = IQ score
σ = standard deviation
μ = mean
Hence, for an IQ score of 100, the z-score is:
[tex]\begin{gathered} z=\frac{100-100}{15}=\frac{0}{15} \\ z=0 \end{gathered}[/tex]For an IQ score of 120, the z-score is:
[tex]\begin{gathered} z=\frac{120-100}{15}=\frac{20}{15} \\ z=1.33 \end{gathered}[/tex]Now, to find the probability of an IQ score between 100 and 120, apply the formula:
[tex]\begin{gathered} P(100Using the standard normal table, we have that:[tex]\begin{gathered} P(z<1.33)=0.90824 \\ P(z<0)=0.5 \end{gathered}[/tex]Therefore, the probability is:
[tex]\begin{gathered} P(0That is the answer.ma ate one slice of pizza, pa ate 2 pizza slices how much pizza did they eat together, what percent of the pizza is not eaten?
According to the given data we have the following:
ma ate one slice of pizza
pa ate 2 pizza slices
Therefore, if there are 8 slices of pizza, the amount of pizza thay they ate together would be calculated as follows:
amount of pizza thay they ate together= number of pieces that they ate together/The total number of pieces
amount of pizza thay they ate together=3/8
amount of pizza thay they ate together=0.375
Therefore to calculate the amount of pizza that is not eaten we would have to make the following calculation:
amount of pizza that is not eaten=1-0.375
amount of pizza that is not eaten=0.625
Therefore, the percent of the pizza is not eaten is 62.5%
Use a net to find the surface area of the prism. The surface area of the prism is ___cm² (Simplify your answer.)
Answer:
1,417 cm²
Explanation:
The net of the prism is attached below:
The surface area of the prism is the area of each of the triangles.
[tex]\begin{gathered} \text{Surface Area=}(13\times32)+(32\times6.5)+(13\times32)+(32\times6.5)+(13\times6.5)+(13\times6.5) \\ =416+208+416+208+84.5+84.5 \\ =1417\operatorname{cm}^2 \end{gathered}[/tex]The surface area of the prism is 1,417 cm².
Need to find circumference of the circle. Use 3.14 for the value of pi. m let diameter = 20 in
the circumference of the circle is 62.8 inches
Explanation
the circumference of a circle is given by:
[tex]\text{Circumference(C)}=\text{ Diameter(D)}\cdot\pi[/tex]Step 1
Let
[tex]\begin{gathered} \pi=3.14 \\ \text{Diameter}=\text{ 20 in} \end{gathered}[/tex]now, replace in the formula
[tex]\begin{gathered} \text{Circumference(C)}=\text{ Diameter(D)}\cdot\pi \\ C=\text{ 20in }\cdot3.14 \\ C=62.8\text{ inches} \end{gathered}[/tex]therefore, the circumference of the circle is 62.8 inches
I hope this helps you
Elan is painting the outside of a rectangular barn door. It is 80 inches high and 60 inches wide. What is the area of the outside door?
Draw the barn dorr
the area of a rectangle is
[tex]A=h\times w[/tex]where h is height and w the width
the replacing
[tex]\begin{gathered} A=80\times60 \\ A=4800 \end{gathered}[/tex]then area of outside dor is 4800 square inches
Mr. Nguyen bought a suit that was on sale for 40% off the original price. He paid 9% salea tax on the sake price. The original price of the suit was $260. How much did he pay for the suit, including tax, to the nearest dollar?
The original price of the suit was $260. If the sale price was 40% off the original price, it means that the amount of discount was
40/100 * 260 = 104
The sale price is 260 - 104 = $156
If he paid sales tax of 9% of the sale price, it means that the amount of tax is
9/100 * 156 = 14.04
Therefore, the amount that he paid including tax is
156 + 14.04 = $170.04
Rounding up to the nearest dollar, the amount is $170
I just need the answer for this, no process or explanation needed, thank you!
1) Considering that the initial amount of Carbon 14 is 40% (0.4) and each year "t" is given in whole numbers. And we were told the amount of k we can insert into the equation:
[tex]\begin{gathered} N=N_0e^{-kt} \\ 0.6=\left(1\right)e^{-0.0001*t} \\ e^{\left\{-0.0001t\right\}}=0.6 \\ lne^{\left\{-0.0001t\right\}}=ln\left(0.6\right) \\ -0.0001t=ln\left(0.6\right) \\ t=5108.25623 \\ t\approx5108years \end{gathered}[/tex]Note that the initial value is 1 and the last one is 0.6 (40% less).
Containers R Us purchased 5 dozen work gloves for $73.80. How much did each pair of gloves cost?
In order to determine the price of each pair, just calculate the quotient in between the total price and the number of dozen works, which were 5:
73.80/5 = 14.76
Hence, each pair of dozen work costed $14.76
Can you please help me
The figure given is a sphere
A surface area of a sphere is given by
[tex]A=4\pi r^2[/tex]The diameter of the sphere is given to be 42 cm
The radius of the sphere is half the diameter =
[tex]r=\frac{42}{2}=21\operatorname{cm}[/tex]Substituting the value of r into the formula
[tex]\begin{gathered} A=4\times\pi\times21^2 \\ A=5541.8\operatorname{cm}^2 \end{gathered}[/tex]The correct answer is option A
Find the next three terms of the arithmetic sequence. 3/5, 7/10, 4/5,...
Answer:
[tex]\frac{9}{10},1\text{ and 1}\frac{1}{10}[/tex]Explanation:
Given the arithmetic sequence
[tex]\frac{3}{5},\frac{7}{10},\frac{4}{5}\text{.}\cdots[/tex]We can rewrite all the fractions using a denominator of 10 as follows:
[tex]\begin{gathered} \frac{3\times2}{5\times2},\frac{7}{10},\frac{4\times2}{5\times2},\cdots \\ =\frac{6}{10},\frac{7}{10},\frac{8}{10},\cdots \end{gathered}[/tex]We observe that the denominator remains the same but the numerator increases by 1.
Therefore, the next three terms of the arithmetic sequence are:
[tex]\begin{gathered} \frac{9}{10},\frac{10}{10}\text{ and }\frac{11}{10} \\ =\frac{9}{10},1\text{ and 1}\frac{1}{10} \end{gathered}[/tex]In a parallelogram, two adjacent sides are 2.c – 7 and 3x – 6. If the perimeter of the parallelogram is 34, find x and the shorter side of the parallelogram X= Shorter Side =
Given the information on the problem, we have the following parallelogram:
since the perimeter is 34, we can write the following equation:
[tex]2(3x-6)+2(2x-7)=34[/tex]solving for x, we get:
[tex]\begin{gathered} 2(3x-6)+2(2x-7)=34 \\ \Rightarrow6x-12+4x-14=34 \\ \Rightarrow10x-26=34 \\ \Rightarrow10x=34+26=60 \\ \Rightarrow x=\frac{60}{10}=6 \\ x=6 \end{gathered}[/tex]now that we have that x = 6, we can find the measure of the sides:
[tex]\begin{gathered} x=6 \\ 3(6)-6=18-6=12 \\ 2(6)-7=12-7=5 \end{gathered}[/tex]therefore, x = 6 and the shorter side measures 5 units
A person can join The Fitness Center for $50. A member can rent the tennis ball machine for $10 an hour. Write a linear function to model the relationship between the number of hours the machine is rented (x) and the total cost (y).
Answer: y=10x+50
Step-by-step explanation:
I need help in this math assignment thank you! :)
Answer: l = 25g
Explanation:
From the information given,
He ties 25 inches of ribbon around each gift.
(g) represents the number of gifts and (r) represents the length of ribbon used. This means that the length of ribbon tied around g gifts is 25g. Thus, the function representing the relationship between the length of ribbon and the number of gifts is
l = 25g
Find the measure of base of the following parallelogram shown below.Area =10.92 cm?2.6 cmAnswer:cm
The area of a paralllelogram can be found by multiplying its base with its height. In this problem we were given the area and the height, therefore we can solve for the base as shown below.
[tex]\begin{gathered} Area=base\cdot height \\ ase=\frac{Area}{height} \\ base=\frac{10.92}{2.6} \\ base=4.2\text{ cm} \end{gathered}[/tex]The base of the parallelogram is 4.2 cm
What change do you have to make to the graph?
EXPLANATION:
Given;
We are given the function below;
[tex]f(x)=3^x[/tex]Required;
We are required to describe what change would be made to graph the function;
[tex]g(x)=3^{x-7}[/tex]For a function given such as the one here, when the graph is shifted to the right, then the original function is affected as follows;
[tex]\begin{gathered} f(x)=x \\ \\ Shift\text{ }to\text{ }the\text{ }right: \\ f(x)+(x)=x \\ \\ Subtract\text{ }(x)\text{ }from\text{ }both\text{ }sides: \\ f(x)+(x)-(x)=x-(x) \\ \\ f(x)=x-(x) \end{gathered}[/tex]For a shift to the left, we would have a plus sign, that is, add x number of units the graph is being shifted.
Therefore, for a function that has changed such as the one given,
[tex]g(x)=3^{x-7}[/tex]What we have is shift the original graph 7 units to the right.
ANSWER:
[tex]Shift\text{ }the\text{ }graph\text{ }7\text{ }units\text{ }right[/tex]The first option is the correct answer.
Which point satisfies both of the following inequalities? -3x + 5y< 15. 5x+y>-5
Explanation.
eWe are told to find the points that satisfy the systems of inequalities
The systems of equations are
[tex]undefined[/tex]Suppose that you borrow $14,000 for five years at 6% toward the purchase of a car. Find the monthly payment and the total interest for the loan.
We have to calculate the monthly payments (number of subperiods per year n = 12) for a loan of $14,000 (P = 14000) for five years (t = 5) at an interest rate of 6% (r = 0.06).
We can use the annuity formula to calculate the monthly payment (PMT) as:
[tex]\begin{gathered} \text{PMT}=\frac{P(\frac{r}{n})}{\lbrack1-(1+\frac{r}{n})^{-nt}\rbrack} \\ \text{PMT}=\frac{14000\cdot(\frac{0.06}{12})}{\lbrack1-(1+\frac{0.06}{12})^{-12\cdot5}\rbrack} \\ \text{PMT}=\frac{14000\cdot0.005}{\lbrack1-1.005^{-60}\rbrack} \\ \text{PMT}\approx\frac{14000\cdot0.005}{1-0.74137} \\ \text{PMT}\approx\frac{70}{0.25863} \\ \text{PMT}\approx270.66 \end{gathered}[/tex]Answer: the monthly payments will be $270.66
Identify any misrepresentation issues in the given graph. ▪︎The horizontal axis scale is not appropriate. ▪︎The horizontal axis ticks are not placed correctly.▪︎ The vertical axis scale is not appropriate. ▪︎The vertical axis ticks are not placed correctly. ▪︎The axis labeling is not complete. ▪︎There are distracting visual effects. ▪︎The graph is designed appropriately.
Looking at the graph, we can see that the x-axis has a lot of unused values, it goes until 50 but the graph only goes until around 25, so the horizontal axis scale is not appropriate.
Also, the x-axis does not have a label, so The axis labelling is not complete.
Last, this is a good graph to represent the temperature over the time, so the graph is designed appropriately.
A person collected $1,400 on a loan of $1,200 they made 7 years ago. If the person charged simple interest, what was the rate of interest?
Solution:
The formula that we can apply in this case is the following:
[tex]r\text{ = (}\frac{1}{t})(\frac{A}{P}-1)[/tex]now, solving we get:
[tex]r\text{ = (}\frac{1}{7})(\frac{1400}{1200}-1)=\text{ }0.02380952[/tex]if we convert this amount into a percentage we get the final answer:
[tex]0.02380952\text{ x 100\% = }2.381[/tex]then, the correct answer is:
2.381% per year
Solve the equation below for x. log(5x) + log(2x) = 1 O A. x = 10/7 O B. x = 1; x = -1 O c. x= 1 O D. There is no solution.
So we need to solve the following equation:
[tex]\log (5x)+\log (2x)=1[/tex]There are a few properties of logarithmic functions that we should remember. First, the logarithm of a negative number doesn't exist which means that x must be a positive number. Second, the addition of logarithms meets the following property:
[tex]\log (a)+\log (b)=\log (a\cdot b)[/tex]If we apply this to our equation we get:
[tex]\log (5x)+\log (2x)=\log (5x\cdot2x)=\log (10x^2)=1[/tex]Now we can pass the logarithm to the right side of the equation:
[tex]\begin{gathered} \log (10x^2)=1 \\ 10x^2=10^1=10 \\ 10x^2=10 \\ x^2=1 \end{gathered}[/tex]There are two possible solutions for x^2=1. These are x=1 and x=-1, however as I stated before x can't be a negative number which means that the solution of the equation is:
[tex]x=1[/tex]Then option C is the correct one.
The lengths of the sides of a triangle are given. Classify each triangle as acute, right, or obtuse.A. 4, 5, 6B. 11, 12, 15
To find out if a triangle is acute, right or obtuse we need to use the following rules:
[tex]\begin{gathered} a^2+b^2>c^2\Rightarrow acute \\ a^2+b^2=c^2\Rightarrow right\text{ } \\ a^2+b^2where c is the largest side of the triangle and a and b are the other two sides.A.
In this case c=6 and we can take the other two as a=4, b=5. Then:
[tex]\begin{gathered} 4^2+5^2?6^2 \\ 16+25\text{?}36 \\ 41>36 \end{gathered}[/tex]Therefore triangle A is an acute triangle.
B.
In this case c=15, b=12 and a=11. Then:
[tex]\begin{gathered} 11^2+12^2?15^2 \\ 121+144\text{?}225 \\ 265>225 \end{gathered}[/tex]Therefore triangle B is an acute triangle.
The volume of a gas, such as helium or air, varies inversely with the pressure on it. If the volume of air is 325 cubic inches under a pressure of 11 psi, what pressure has to be applied to decrease the volume to 143 cubic inches?
ANSWER
The pressure is 25 psi
STEP-BY-STEP EXPLANATION:
From the question provided, you can see that the relationship between the volume of a gas and the pressure is an inverse relationship.
The volume of a gas varies inversely with the pressure on it
This implies that as the volume of the gas increases the pressure of the gas decreases and vice versa.
The next thing is to assign variables
Let the volume of the gas be V
Let the pressure of the gas be P
Mathematically, this can be represented as
[tex]\begin{gathered} V\text{ }\propto\text{ }\frac{1}{P} \\ \text{Introduce a proportionality constant K} \\ V\text{ = }\frac{K}{P} \\ \text{Cross multiply} \\ K\text{ = VP -------- equation 1} \\ \end{gathered}[/tex]The next step is to find the value of K from the given information in the question
• Volume = 325 cubic inches
,• Pressure = 11 psi
Recall that, K = VP
K = 325 * 11
K = 3,575
Since you have gotten the value of K, then, you can now find your pressure when the volume Is 143 cubic inches
[tex]\begin{gathered} V=143inches^3 \\ K\text{ = 3,575} \\ K\text{ = VP} \\ \text{Divide both sides by V} \\ \frac{K}{V}\text{ = }\frac{VP}{V} \\ P\text{ = }\frac{K}{V} \\ P\text{ = }\frac{3575}{143} \\ P\text{ = 25 ps}i. \end{gathered}[/tex]Hence, the pressure is 25 psi
Writing an equation in slope intercept form for the line passing through each pair of points. (0,3) (1,-2)
Calculating the slope of the line with points (0,3) (1,-2)
[tex]\begin{gathered} m=\frac{y2-y1}{x2-x1}=\frac{-2-3}{1-0}=\frac{-5}{1}=-5 \\ m=-5 \end{gathered}[/tex]With the slope and one of the points we find the y-intercept with the equation y=mx +b.
y= mx + b (m: slope , b=y-intercept)
3=-5(0) + b (Replacing m=-5 and the point (0,3))
3= 0 + b (Multiplying)
3=b
The answer is y=-5x + 3.
The force of the wind blowing on a window positioned at a right angle to the direction of the wind varies jointly as the area of the window and the square of the wind's speed. It is known that a wind of 30 miles per hour blowing on a window measuring 4 feet by 5 feet exerts a force of 150 pounds. During a storm with winds of 60 miles per hour, should hurricane shutters be placed on a window that measures 3 feet by 4 feet and is capable of withstanding 300 pounds of force?
We have the following:
The force of wind: F = 150 pounds
The square of the winds speed: V = 30 miles per hour
The area of the windows: A = 4*5 = 20 square feet
The formula is:
[tex]F=kAV^2[/tex]replacing:
[tex]\begin{gathered} 150=k\cdot20\cdot30^2 \\ k=\frac{150}{20\cdot900} \\ k=\frac{1}{120} \end{gathered}[/tex]now, the force of wind with 60 miles per hour and 12 (3*4) square feet
[tex]\begin{gathered} F=\frac{1}{120}\cdot12\cdot60^2 \\ F=360_{} \end{gathered}[/tex]The answer is 360 pounds
Based on the graphs of f (x) and g(x), in which interval(s) are both functions increasing?Polynomial function f of x, which increases from the left and passes through the point negative 4 comma negative 4 and goes to a local maximum at negative 3 comma 0 and then goes back down through the point negative 2 comma negative 2 to a local minimum at the point negative 1 comma negative 4 and then goes back up through the point 0 comma 0 to the right, and a rational function g of x with one piece that increases from the left in quadrant 2 asymptotic to the line y equals 1 passing through the points negative 6 comma 2 and negative 2 comma 6 that is asymptotic to the line x equals negative 1 and then another piece that increases from the left in quadrant 3 asymptotic to the line x equals negative 1 passing through the point 0 comma negative 4 and 4 comma 0 that is asymptotic to the line y equals 1(–°, –3) ∪ (–1, °)(–°, –3) ∪ (4, °)(–°, –3)(–°, °)
Increasing intervals for f(x) and g(x); A function is incrasing when the y-value increases as the x-value increases.
f(x) and g(x) increases in two intervals (x-intervals):
From negative infinite to -3
From -1 to infinite
[tex](-\infty,-3)\cup(-1,\infty)[/tex]Both intervals are increasing through (-∞,-3) U (-1,∞)
A boat is heading towards a lighthouse, whose beacon-light is 108 feet above the water. From pointA, the boat’s crew measures the angle of elevation to the beacon, 8 degrees, before they draw closer. They measure the angle of elevation a second time from pointB at some later time to be 16∘. Find the distance from point A to point B. Round your answer to the nearest foot if necessary.
Given: The information of a boat heading towards a lighthouse
To Determine: The distance from point A to point B
Solution: The information provided can be translated into the diagram below
[tex]\begin{gathered} m\angle ADC+m\angle DAC=90^0 \\ m\angle ADC+8^0=90^0 \\ m\angle ADC=90^0-8^0 \\ n\angle ADC=82^0 \end{gathered}[/tex][tex]\begin{gathered} m\angle BDC+m\angle DBC=90^0 \\ m\angle BDC=90^0-m\angle DBC \\ m\angle BDC=90^0-16^0 \\ m\angle BDC=74^0 \end{gathered}[/tex]Using SOH CAH TOA
[tex]\begin{gathered} \tan 74^0=\frac{BC}{108} \\ BC=108\tan 74^0 \\ BC=108\times3.4874 \\ BC=376.64ft \\ BC\approx377ft(nearest\text{ foot)} \end{gathered}[/tex][tex]\begin{gathered} \tan 82^0=\frac{AC}{108} \\ AC=108\times\tan 108 \\ AC=108\times7.115 \\ AC=768.4599 \end{gathered}[/tex][tex]\begin{gathered} AB=AC-BC \\ AB=768.45993-376.64 \\ AB=391.8199 \\ AB\approx392ft \end{gathered}[/tex]Hence, the distance from point A to point B is 392ft (nearest foot)
John bought a 20 pound bag of dog food. He feeds his dog twice a day. If John gives his dog 3/4 pound of dog food each feeding, how many days will it last?
Total weight of the bag of dog food bought by John = 20 Pounds
Number of times the dog is fed in a day = 2
Weight consumed by the dog at each feeding = 3/4 Pound.
Therefore:
[tex]\begin{gathered} \text{Weight of food used per day = 2 }\times\frac{3}{4}\text{ } \\ =\frac{6}{4} \\ =\frac{3}{2}\text{ Pounds} \end{gathered}[/tex]To determine how many days the 20-pound bag will last, we have:
[tex]\begin{gathered} \frac{20\text{ Pounds}}{\frac{3}{2}\text{ Pounds per day}} \\ =20\times\frac{2}{3} \\ =\frac{40}{3} \\ =13\frac{1}{3}\text{ days} \end{gathered}[/tex]The 20-pound bag of dog food will last 13 1/3 days.
find the unit price and round your answer to the nearest cent. you make $512.92 a week. if you work 36 hours find your hourly rate of pay
EXPLANATION
Given that we make $512.92 by week and we work 36 hours, we can apply the unitary method in order.
[tex]\text{hourly rate=}\frac{512.92\text{ dollars}}{36\text{ hours}}=14.25\text{ }\frac{dollars}{\text{hour}}[/tex]In conclusion, the hourly rate is 14.25 dollars.
what is the standard deviation of the following data set rounded to the nearest tenth
The general formula for the standard deviation is:
[tex]\sigma=\sqrt{\frac{\Sigma(x_i-\mu)^2}{N}}[/tex]in which, N is the number of data, and μ is the sample's mean.
Start by calculating the sample's mean
[tex]\begin{gathered} \mu=\frac{7.7+8.4+9+8+6.9}{5} \\ \mu=8 \end{gathered}[/tex]then, apply the standard deviation formula
[tex]\begin{gathered} \sigma=\sqrt{\frac{(7.7-8)^2+(8.4-8)^2+(9-8)^2+(8-8)^2+(6.9-8)^2}{5}} \\ \\ \sigma=\sqrt{\frac{(-0.3)^2+(0.4)^2+(1)^2+(0)^2+(-1.1)^2}{5}} \\ \\ \sigma=\sqrt{\frac{2.46}{5}} \\ \\ \sigma=\sqrt{0.492} \\ \sigma=0.701\approx0.7 \end{gathered}[/tex]Answer:
The standard deviation is 0.7
Modeling System of Equations Per 2
Based on the given information, you can write the following equations for the costs:
y1 = 35x + 75
y2 = 38x
If the cost is the same for both companies, you have:
35x + 75 = 38x
you can solve the previous equation for x to determine the number of people:
35x + 75 = 38x subtract 35x both sides
75 = 38x - 35x
75 = 3x divide by 3 both sides
75/3 = x
25 = x
Hence, the number of people is 25