The beam of light house makes one complete revolution every 20 seconds how many degrees is it rotate in five seconds
Answers
Answer:
Every 5 seconds the beam rotates 90 degrees;
[tex]90^{\circ}[/tex]Explanation:
Given that the beam of a lighthouse makes one complete revolution every 20 seconds.
one complete revolution is;
[tex]360^{\circ^{}}[/tex]The rate of rotation is;
[tex]r=\frac{360^{\circ}}{20}=18^{\circ}\text{ per second}[/tex]The number of degrees it will rotate in 5 seconds is;
[tex]\begin{gathered} x=5\times r=5\times18^{\circ}per\text{ second} \\ x=90^{\circ} \end{gathered}[/tex]Therefore, every 5 seconds the beam rotates 90 degrees;
[tex]90^{\circ}[/tex]Related Questions
Estimate the local minimum of y = −³ − 5x² − 3x + 9.-OA. (1.5,-10.25)OB. (-3,0)C. there is no local minimumOD. (-0.33,9.48)Reset Selection
Answers
Given: The function below
[tex]y=-x^3-5x^2-3x+9[/tex]To Determine: The local minimum
Solution
The graph of the function is as shown below
Hence, the local minimum from the graph above is (- 3, 0), OPTION B
A system of equations is given below.x + 2y = 24x − 5y = 8Identify the constant that can be multiplied by both sides of the first equation to eliminate the variable x when the equations are added together.thenWrite the revised system of equations.
Answers
Answer:
[tex]constant\rightarrow-4[/tex]Explanation: We have to find the constant that when multiplied to the first equation and added to the second, the variable x gets canceled out, the two equations are as follows:
[tex]\begin{gathered} x+2y=2\rightarrow(1) \\ 4x-5y=8\rightarrow(2) \end{gathered}[/tex]Multiplying the equation (1) by -4 and adding it to the equation (2) gives the following answer:
[tex]\begin{gathered} -4\times(x+2y)=-4\times2\rightarrow-4x-8y=-8 \\ \begin{equation*} -4x-8y=-8 \end{equation*} \\ + \\ \begin{equation*} 4x-5y=8 \end{equation*} \\ ---------------------- \\ -3y=0 \end{gathered}[/tex]Therefore the value of the constant is -4.
The product of 5 – 2i and i is1) 72) 2 + 5i3) 5 – 2i4) -2 + 5i
Answers
Answer:
2) 2 + 5i
Explanation
Fom the given question, we are find the product of 5-2i and i
i(5-2i)
Expand
= 5i - 2(i^2)
From complex number i^2 = -1
Substitute
= 5i - 2(-1)
= 5i + 2
= 2 + 5i
Hence the product is 2 + 5i
Solve the equation.g−37=27g− 73 = 72 g, minus, start fraction, 3, divided by, 7, end fraction, equals, start fraction, 2, divided by, 7, end fractiong=g=g, equals
Answers
ANSWER
[tex]\text{ g = }\frac{5}{7}[/tex]EXPLANATION
We want to solve for g in:
[tex]g\text{ - }\frac{3}{7}=\frac{2}{7}[/tex]Collect like terms by moving 3/7 to the right hand side:
[tex]\begin{gathered} g\text{ = }\frac{2}{7}+\frac{3}{7} \\ \Rightarrow\text{ g = }\frac{5}{7} \end{gathered}[/tex][tex]4112 \div 5 = 822 remainder 2[/tex]drag each expression to a box to show whether it is a correct way to check the answer to this equation
Answers
given that
4112/5 = 822 remainder 2
to get the correct way and incorrect way.
so
For,
822 x 5 = 4110
For,
822 x 2 + 5 = 1649
For,
822 x 5 + 2 = 4112
therefore,
The correct way to check The incorrect way to way to check
822 x 5 + 2 822 x 5
822 x 2 + 5
PLEASE HELP ANSWER THESE 3 VERY IMPORTANT QUESTIONS!!!
1. The average high temperatures in degrees for a city are listed.
58, 61, 71, 77, 91, 100, 105, 102, 95, 82, 66, 57
If a value of 98° is added to the data, how does the mean change?
2. The average high temperatures in degrees for a city are listed.
58, 61, 71, 77, 91, 100, 105, 102, 95, 82, 66, 57
If a value of 48° is added to the data, how does the median change?
3. The average high temperatures in degrees for a city are listed.
58, 61, 71, 77, 91, 100, 105, 102, 95, 82, 66, 57
If a value of 80.8° is added to the data, how does the range change?
Answers
If a value of 98° is added to the data, then the mean change is 1.35, if a value of 48° is added to the data, then the median change from the 6th number to the 7th number but the value still same, if a value of 80.8° is added to the data then the range still same.
In the given question we have to find the change in mean, median and range after the addition of another value.
(1) The list of average high temperatures in degrees for a city is
58, 61, 71, 77, 91, 100, 105, 102, 95, 82, 66, 57
So the mean is find as the sum of value divided by the total number of values.
As we see that the total number of values are 12.
Now the sum of values
∑x=58+61+71+77+91+100+105+102+95+82+66+57
∑x=965
Mean = ∑x/n
Mean = 965/12
Mean = 80.42
If a value of 98° is added to the data, then the sum of values will be
∑x'=58+61+71+77+91+100+105+102+95+82+66+57+98
∑x'=1063
The total number of values = 13
So the
Mean'=∑x'/n'
Mean'=1063/13
Mean'=81.77
Now the change in mean=Mean'−Mean
change in mean=81.77−80.42
change in mean=1.35
(2) The list of average high temperatures in degrees for a city is
58, 61, 71, 77, 91, 100, 105, 102, 95, 82, 66, 57
So the median is find after arranging the values in ascending order.
57, 58, 61, 66, 71, 77, 82, 91, 95, 100, 102, 105
Total number=12
Meadian=n/2 th number
Meadian=12/2 th number
Meadian=6 th number
Meadian= 77
If a value of 48° is added to the data.
So the ascending order of the number is
48, 57, 58, 61, 66, 71, 77, 82, 91, 95, 100, 102, 105
Total number=13
Meadian=(n+1)/2 th number
Meadian=13+1/2 th number
Meadian=14/2 th number
Meadian=7 th number
Meadian=77
Now the range changes from the 6th number to the 7th number but the value still same.
(3) The list of average high temperatures in degrees for a city is
58, 61, 71, 77, 91, 100, 105, 102, 95, 82, 66, 57
So the range is find after subtracting the greatest number to the smallest number.
So the range=Greatest Number−Largest Number
range=105−57
range=48
If a value of 80.8° is added to the data then the range still same because the added value is between the largest and smallest number.
To leran more about mean, median and range link is here
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If f(1) = 2 and f(n) = f(n - 1)^2 – 5 then find the value of f (4).
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We are asked to calculate f(4) by means of the following function:
f(n) = f(n - 1)² - 5
As you can see, in order to calculate f(n) first we have to specify the value of f(n - 1), we are given the value of f(1), so we can calculate the value of f(2), then f(3) and finally f(4), like this:
f(2) = f(2-1)² - 5 = f(1)² - 5 = 2² - 5 = 4 - 5 = -1
Then, f(2) = -1, now we can calculate f(3) like this:
f(3) = f(3 - 1)² - 5 = f(2)² - 5 = (-1)² - 5 = -4
Then f(3) = -4, now we can calculate f(4) like this:
f(4) = f(4 - 1)² - 5 = f(3)² - 5 = (-4)² - 5 = 16 - 5 = 11
Then, f(4) equals 11
In the diagram below, ALMK - APMN. Based on the relationship between the triangles, which of the following proportions is true? KA d.
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we know that
If two figures are similar, then the ratio of its corresponding sides is proportional
In this problem
triangle LMK and triangle PMN are similar
that means
LM/PM=MK/MN=LK/PN
therefore
answer is
option aEach person has two parents, four grandparents, eight great-grandparents, and so on. What is the total number of ancestors a person has, going back five generations? twelve generations?
Answers
62
8190
1) Gathering the data:
So Adding the 2 + 4 +8 +16+32 Then we can write that up to the 5th generation each person has 62 ancestors.
2) Or we can check. Let's write out considering that the ratio is 2 and the first term is 2 since the person per se is not counted.
[tex]\begin{gathered} S=\frac{a_1(1-r^n)}{1-r} \\ S_5=\text{ }\frac{2(1-2^5)^{\square}}{1-2}=62 \\ S_{12}=\frac{2(1-2^{11})}{1-2}=8190 \end{gathered}[/tex]3) Hence, each person has counting back up to the 5th generations 62 ancestors and 4094 when it comes to 11 generations
It takes approximately 4.65 quarts of milk to make a pound of cheese. Express this amount as a mixed number in simplest form.
Answers
The mixed number in simplest form would be 4 and 13/20.
How to convert decimals into mixed fractions?Separate the whole part from the number at the decimal point.The number behind the decimal point becomes the numerator of the fraction.Find the place value of the decimal part. This is the denominator of the fraction.Write the whole part of the number followed by the numerator over the denominator of the fraction.If possible, simplify the fractional part using common factors.Convert 3.4 to a mixed number
The whole part of the number is 3.
The numerator of the fraction is 4.
The place value of the decimal part is tenths, so the denominator of the fraction is 10.
The mixed number is 3*4/10
To learn more about mixed fractions refer to:
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A ball is thrown upward and outward from a height of 6 feet. The height of the ball, f(x), in feet, can be modeled byf(x)=−0.6x2+2.7x+6where x is the ball's horizontal distance, in feet, from where it was thrown. Use this model to solve parts (a) through (c).a. What is the maximum height of the ball and how far from where it was thrown does this occur?The maximum height is 1010 feet, which occurs 22 feet from the point of release.
Answers
We need to find the vertex of the parabola
Vertex (h,k) is given by the following formula:
[tex]\begin{gathered} (h,k) \\ h=-\frac{b}{2a} \\ k=f(h) \end{gathered}[/tex]Where, a and b are coefficients of the quadratic equation
[tex]f(x)=ax^2+bx+c[/tex]in this example:
[tex]f(x)=-0.6x^2+2.7x+6[/tex]Therefore,
a = 0.6
b = 2.7
Now, we know that, we can find vertex (h,k)
[tex]h=-\frac{2.7}{2\cdot(-0.6)}=2.25[/tex]now, let's determine k
[tex]\begin{gathered} k=f(h)=f(2.25)=-0.6\cdot(2.25)^2+2.7\cdot(2.25)+6 \\ k=9.0375 \end{gathered}[/tex]So, the vertex of the parabola is the point (2.25 , 9.0375)
This means that the maximum height of the ball is k = 9.0375 ft and it occurs h = 2.25 ft from where it was thrown
At a bowling alley, the cost of shoe rental is $2.55 and the cost per game is $3.75. If f (n) represents the total cost of shoe rental and n games, what is the recursive equation for f (n)? f (n) = (2.55 + 3.75)n, n > 0 f (n) = 2.55 + 3.75n, n > 0 f (n) = 2.55 + 3.75 + f (n − 1), f (0) = 2.55 f (n) = 3.75 + f (n − 1), f (0) = 2.55
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To find the recursive function we need to take into account that shoe rental doesn't depend on the number of games you play. You rent a pair of shoes and you pay for it just once, but the cost per game does depend on the number of games (n), then the total cost of shoe rental and n games will be:
[tex]\begin{gathered} f(n)=\cos t\text{ of shoe rental + cost per game x number of games} \\ f(n)=2.55+3.75n,n>0 \end{gathered}[/tex]Write the equation to represent the following relationship. y varies inversely with x. When y = 4, x = 3.
Answers
EXPLANATION
The relationship that represents the equation is the following:
[tex]y=\frac{k}{x}[/tex]Plugging in x=3 and y=4 into the equation:
[tex]4=\frac{k}{3}[/tex]Multiply 3 to both sides:
[tex]3*4=k[/tex]Multiplying numbers:
[tex]12=k[/tex]Switching sides:
[tex]k=12[/tex]Therefore, the equation is the following:
y= 12/x
6- 5 and 1/2 pls help
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First, express the mixed number as a fraction:
[tex]5\frac{1}{2}=\frac{\lbrack(5\times2)+1\rbrack}{2}=\frac{11}{2}[/tex][tex]6-\frac{11}{2}[/tex]multiply 6 by (2/2)
[tex]6\times\frac{2}{1}-\frac{11}{2}=\frac{12}{2}-\frac{11}{2}=\frac{1}{2}[/tex]A batting average of 0.250 in baseball means a player, on average gets 25 hits in 100 times at bat. How many hits would he expect to get in 360 times at bat
Answers
From the given information:
Batting average of the player = 0.25.
This means that, on average, the player gets 25 hits in 100 times at-bat.
Therefore:
The number of hits which he would expect to get in 360 times at-bat
= Batting Average X Number of Times at-bat
[tex]\begin{gathered} =0.25\text{ x 360} \\ =90 \end{gathered}[/tex]The baseball player would expect to get 90 hits in 360 times at-bat.
Another approach is to use ratio.
[tex]\frac{25\text{ Hits}}{100\text{ times at bat}}=\frac{x\text{ Hits}}{360\text{ times at bat}}[/tex]Cross multiply
[tex]\begin{gathered} 100x=25\text{ }\times\text{ 360} \\ 100x=9000 \end{gathered}[/tex]Divide both sides by 100 to solve for x
[tex]x=90[/tex]Therefore, the baseball player would expect to get 90 hits in 360 times at-bat.
You spin the spinner twice.678What is the probability of landing on an odd number and then landing on a 6?Simplify your answer and write it as a fraction or whole number.
Answers
We are asked to determine the probability of landing on an odd number and then landing on a 6.
To do that we will use the product rule of probabilities:
[tex]P(AandB)=P(A)P(B)[/tex]Where:
[tex]\begin{gathered} A=\text{ landing on an odd number} \\ B=\text{ landing on a 6} \end{gathered}[/tex]To determine the value of the probability of A we need to have into account that there is only 1 odd number (7) out of 3 possible numbers, therefore, the probability is:
[tex]P(A)=\frac{1}{3}[/tex]Now, to determine the value of the probability of "B" we need to have into account that there is only one number 6 out of 3 numbers therefore, we have:
[tex]P(B)=\frac{1}{3}[/tex]Now, we substitute the values:
[tex]P(AandB)=(\frac{1}{3})(\frac{1}{3})[/tex]Now, we solve the operations:
[tex]P(AandB)=\frac{1}{9}[/tex]Therefore, the probability is 1/9
The data are at the ordinal level of measurement.What is wrong with the given calculation?Identify the level of measurement of the data, and explain what is wrong with the given calculation.In a set of data, blood lead levels are represented as 10 for low, 20 for medium, and 30 for high. The average (mean) of the 595 blood lead levels is 25.4.A. One must use a different method to compute the average (mean) of such data.B. Such data should not be used for calculations such as an average (mean).C. The true average (mean) is 18.2.D. There is nothing wrong with the given calculation.
Answers
Answer: Blood lead levels are represented as 10 for low, 20 for medium, and 30 for high.
The average (mean) of the 595 blood lead levels is 25.4, assuming that each blood lead level is also known, then:
[tex]A=\frac{\sum_i^{595}x_i}{595}=25.4\Rightarrow\text{ Average}\rightarrow(1)[/tex]As (1) is the perfectly reasonable mathematical approach to calculating the average, however, the blood lead levels are reported in 10 20 30 levels only, therefore, the answer is:
[tex]\text{ Such data should not be used for calculations such as an average \lparen mean\rparen}\Rightarrow\text{ Option\lparen B\rparen}[/tex]Or the Option(B).
y (-3 - 8x) how can i expand this expression with a variable?
Answers
Statement Problem: Expand the expression;
[tex]y(-3-8x)[/tex]Solution:
We would multiply the variable with each of the term.
[tex]\begin{gathered} y(-3-8x) \\ (y\times-3)+(y\times-8x) \\ -3y-8xy \end{gathered}[/tex]what are the points that are on the graph of the line 2x + 4y = 20
Answers
Answer:
The points are 10 on the x-axis, and 5 on the y-axis
Explanation:
Given the line:
2x + 4y = 20
The values that satisfy this equation are x = 10, y = 5
The points are 10 on the x-axis, and 5 on the y-axis
Look at the graph of the line below:
The line intersects the x-axis at point 10, and the y-axis at point 5
9(m - 3) + 3m = 7m + 43
Answers
Train A travels 30 miles in 20 minutes at a constant speed. Train B travels 20 miles in 15 minutes at a constant speed. Redo Which train is going faster? Circle your answer and show how you figured it out below, Train A Train B
Answers
Find the equation of the line through the followingpair of points: (2, -10) and (4, -7).
Answers
Lets find the slope first:
Slope (m) is change in y's by change in x's
Change in y: -7 - - 10 = -7 + 10 = 3
Change in x: 4 - 2 = 2
Slope = 3/2 (this is m)
So, the equation is:
[tex]\begin{gathered} y=mx+b \\ y=\frac{3}{2}x+b \end{gathered}[/tex]b is the y-intercept.
We can get it by plugging in any point. Let's put (2, -10). So we have:
[tex]\begin{gathered} y=\frac{3}{2}x+b \\ -10=\frac{3}{2}(2)+b \\ -10=3+b \\ b=-10-3 \\ b=-13 \end{gathered}[/tex]Final equation is:
[tex]\begin{gathered} y=\frac{3}{2}x+b \\ y=\frac{3}{2}x-13 \end{gathered}[/tex]Which phrase represents the algebraic expression below? 8 + 9x O A. the sum of nine and the quotient of a number x and eight O B. the product of eight and nine less than a number x O C. the product of nine, a number x, and eight OD. the sum of eight and the product of nine and a number x 11
Answers
Given data:
The given expression is 8+9x.
The given expression can be read as sum of 8 and product of nine times the number.
Need to write the formula and then make a graph for the following problem. Number of tablespoons T = the number of teaspoons X divided by3
Answers
Given:
The number of tablespoon is T.
The number of teaspoon is X.
The objective is to write formula and make a graph for the statement, Number of tablespoons T = the number of teaspoons X divided by 3.
Explanation:
The equation can be written as,
[tex]T=\frac{X}{3}[/tex]To plot the graph:
Consider 3 values of X -3, 0, 3.
Substitute the values of X in the obtained equation to find the value of T.
At X = -3,
[tex]\begin{gathered} T=\frac{-3}{3} \\ T=-1 \end{gathered}[/tex]Thus, the coordinate is (-3,-1).
At X = 0,
[tex]\begin{gathered} T=\frac{0}{3} \\ T=0 \end{gathered}[/tex]Thus, the coordinate is (0,0).
At X = 3,
[tex]\begin{gathered} T=\frac{3}{3} \\ T=1 \end{gathered}[/tex]Thus, the coordinate is (3,1).
On plotting the coordinates in the graph,
Hence, the required equation is T = (X/3) and the graph of the equation is obtained.
Is AABC - ADEF? Explain your reasoning. B E 6 units US Enter your altswer and explanation. 1 polie
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SAS Similarity Theorem
If two sides of one triangle are proportional to two sides of another triangle and the included angle in both are congruent, then the triangles are similar by the SAS theorem.
We need to check if the conditions are met in the triangles given in the question.
First, let's test the proportionality of the sides.
In triangle ABC, side AB has a measure of 9 units
In triangle DEF, side DE has a measure of 6 units.
The proportion is 9/6 = 1.5. This is the scale factor.
Now check the other given sides.
In triangle ABC, side CA has a measure of 6 units
In triangle DEF, side FD has a measure of 4 units.
Proportion is 6/4 = 1.5
Given the scale factor is identical for both triangles, the first condition is met.
Now we can see the included angles BAC and EDF are congruent because they have the same measure of 40°.
Since both conditions are met, we conclude the triangles are similar by the SAS theorem
This statics question has me stumped if you could hope me I would rlly appreciate it! Have a nice night :).
Answers
Spinner A
Sample space = 1,2,3,4,5,6
Number of total outcome = 6
Odd numbers = 1,3,5
Number of odd numbers = 3
[tex]\text{Probability = }\frac{n\text{umber of required outcomes}}{\text{total number of possible outcome}}[/tex]Probability of spinning an odd number = 3/6 = 1/2
Spinner B
Sample space = yellow, brown, red
Number of total outcome = 3
Not yellow = brown, red
Number of not yellow = 2
Probability of not yellow = 2/3
Since the two spinners are independent events, then the probability that you spin an odd number and not yellow are multiplied together
Thus we have,
Probability of spinning an odd number X Probability of not yellow
[tex]\frac{1}{2}\text{ X }\frac{2}{3}\text{ = }\frac{2}{6}[/tex]Final answer is 1/3.
A bag contains:• 3 red marbles• 2 orange marbles• 1 yellow marble• 4 green marblesRico will randomly choose a marble. Then he will put itback and randomly choose another marble. What isthe probability that he will choose a red and then anorange marble?
Answers
The probability is given by the following formula:
Probability = number of favorable outcomes / total number of outcomes
The total number of outcomes is 10, 3 of the initial number of marbles are red and 2 of them are orange.
The probability of getting a red marble in the first draw is:
Probability = 3/10
The probability of getting an orange marble in the second draw is:
Probability = 2/10 = 1/5
the probability that he will choose a red and then an orange marble can be calculated by multiplying the probabilities that we found, then we get:
Probability = 3/10 × 1/5 = 3/150 = 1/50
Then, the answer is 1/50
What percent is 12 of 407
Answers
To find the percent, we just have to divide.
[tex]\frac{12}{407}=0.0295[/tex]Then, we multiply by 100 to express it in percentage.
[tex]0.0295\cdot100=2.95[/tex]Hence, 12 represents 2.95% of 407.Kiran read for x minutes, and Andre read 5/8 more than that. Write an equation that relates the number of minutes Kiran read with Y ,the number of minutes Andre read. "Use decimals in the equation.DO NOT ROUND"
Answers
The time for which Kiran read is x minutes.
Determine the time for which Andre read.
[tex]\begin{gathered} Y=x+\frac{5}{8}\cdot x \\ =x+0.625x \\ =\text{1}.625x \end{gathered}[/tex]Thus answer is Y = 1.625 x.
Learning Diagnostic Analytics Recommendations Skill plans Social stu La Language arts All Science Math Eighth grade ) T.11 Volume of cones YYR A cone has a height of 14 meters and a diameter of 12 meters. What is its volume? Use A 3.14 and round your answer to the nearest hundredth. cubic meters Submit
Answers
The volume of a cone is calculated as follows:
[tex]V=\pi\cdot r^2\cdot\frac{h}{3}[/tex]where r is the radius and h is the height of the cone.
Given that the diameter of the cone is 12 meters, then its radius is 12/2 = 6 meters
Substituting into the equation with h = 14 m, and r = 6 m, we get:
[tex]\begin{gathered} V=3.14\cdot6^2\cdot\frac{14}{3} \\ V=3.14\cdot36\cdot\frac{14}{3} \\ V=527.52m^3 \end{gathered}[/tex]