Mathematics High School

A tree casts a shadow that is about 15ft. long. Javier, who is about 5.5 ft. tall, is standing near the tree. Javier's shadow is about 4.5 ft. long. What is the estimated height, t, of the tree?

A. 9.6 ft.
B. 12 ft.
C. 15 ft.
D. 18 ft.

Answers

Answer 1
the answer would be B

Related Questions

(x+10)+(3x+2)=180
What is x

Answers

Hi there!

To solve this problem, we need to simplify.

(x + 10) + (3x + 2) = 180
x + 3x + 10 + 2 = 180

We combine like terms first:
4x + 12 = 180

And isolate x.
4x = 168

Now, we divide both sides of the equation by 4 to solve for x.
x = 168 ÷ 4

x = 42

Hope this helps!
Hi there (: I hope this helps:

Step 1: Simplify both sides of the equation.x+10+3x+2=180(x+3x)+(10+2)=180 (Combine Like Terms)4x+12=1804x+12=180
Step 2: Subtract 12 from both sides.4x+12−12=180−124x=168
Step 3: Divide both sides by 4.4x/4=168/4
x=42

PLEASE HELP PLEASE HURRY!!!!!!!!!
BRAINLIEST AVAILABLE

Answers

Rule for 1 is the rule for 1 is 14 times 3.5^x and it is exponential

The second one is is also exponential and the rule is 32 times .25^x and the last one is is linear and the rule is 5x+-4
I'm just going to give you the answers. You can figure out how they were obtained. Actually the hints are at the bottom of your exercise. You need only juggle them a bit to get the answers.

1]
y = 14 * (7/2)^x This is never going to linear.

2]
y = 32/(4)^x This also is not linear.

3]
y = 5x - 4 This one is linear

If you have a graphing calculator, you might think about graphing these three. The questions are a bit of by guess and by golly. You just have to keep on trying things until you get it. Look at 0 as an x value first. 

There are 18 animals and 40 legs in all so lets see how many cows could be born. 4,8,16,12,24,28,32,36,40. so there could be 9 cows and now lets see on chickens 2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40. so the could be 20 chickens so if u think. i think the ancewer is 30 chickens and 10 cowws thx!!!!

Answers

--------------------------------------
Given information
--------------------------------------
Total animals = 18
Total legs = 40

--------------------------------------
Assumed all are chickens
--------------------------------------
Total legs = 18 x 2 = 36

--------------------------------------
Calculate extra legs
--------------------------------------
40 - 36 = 4

--------------------------------------
Difference in legs between the cow and chicken
--------------------------------------
4 - 2 = 2

--------------------------------------
Find the number of cows
--------------------------------------
4 ÷ 2 = 2

--------------------------------------
Find the number of chickens
--------------------------------------
18 - 2 = 16

--------------------------------------
Answer: 16 chickens and 2 cows
--------------------------------------

helppppppppppppppppp

Answers

Answer:
14.1 in

Explanation:
The equation relating the length of arc, radius of circle and angle is:
S = rθ
where:
S is the length of the arc
r is the radius of the circle = 6 in
θ is the angle in radians = 135 degrees = (135*π) / 180 = 0.75 π radian

Substitute with the givens in the above equation to get the length of the arc as follows:
S = rθ
S = 6 * 0.75π
S = (9/2) π which is approximately 14.1in

Hope this helps :)

Guys please help me

this is a system of equation word problem

Answers

The starting weight was 185, and the rate of change was -3 (per day).
.. w = 185 -3d . . . . . . d is the number of days, w is the weight in pounds


Evaluating this for d=7, we have
.. w = 185 -3*7 = 164
The point is represented by the ordered pair (7, 164).


The value on day 7 corresponds to the weight loss due to rejection. We might conclude the reaction to rejection was the cause of death.

A bakery bakes 10 cakes per hour & had 3 from the day before. What equation represents this?

A.y = 10x + 3
B.y = 3x + 10
C.y = x + 13
D.y = 13x

Answers

y represents the total number of cakes the bakery make.
x represents the number of hours spent

y = 10x + 3

-----------------------------
Answer: 10x + 3
-----------------------------

Which expression shows a sum of three terms? (1 point)

3x

3 + x

x^3

x + 3 + x

Answers

The last expression shows the sum of three terms. The sum is the amount resulting in addition.

The answer is x + 3 + x

Answer:

x + 3 + x

Step-by-step explanation:

3x :

This is a product of two terms, where x is any variable.

3 + x :

This is sum of two terms,where x is any variable.

x^3 :

This expresses x to the power of three. It can also be written as  (x times x times x ). Thus it is the product of three terms, where x is any variable.

x + 3 + x :

This is the sum of three terms, where x is any variable.

Thus answer is x + 3 + x

Ivan earns $8 each time he walks his neighbors dog.he already walked his neighbors dog 5 times.how many more times does he need to walk the dog to earn enough money to buy a game that costs $88

Answers

He needs to walk the dog 6 more times. This is because it takes 11 walks to get to $88 and he only has done 5 so far. Subtract 5 from 11 to get your answer.

Answer:

6 more times

Step-by-step explanation:

How to find the equation of a circle

Answers

hmmm lemme do the first one only

[tex]\bf \textit{equation of a circle}\\\\ (x- h)^2+(y- k)^2= r^2 \qquad center~~(\stackrel{5}{ h},\stackrel{3}{ k})\qquad \qquad radius=\stackrel{2}{ r} \\\\\\ (x-5)^2+(y-3)^2=2^2\implies (x-5)^2+(y-3)^2=4[/tex]

Final answer:

To find the equation of a circle, use the formula (x - h)² + (y - k)² = r², where (h,k) is the center of the circle and r is its radius. You apply this knowledge to other circular calculations, such as the angular velocity or the position and velocity of a moving point on the perimeter of the circle.

Explanation:

Finding the Equation of a Circle

To find the equation of a circle, you need to know the circle's radius (r) and the coordinates of its center (h,k). The general form of the equation is (x - h)² + (y - k)² = r². The values of h and k are the x and y coordinates of the center of the circle, respectively. If you recall the formula for the circumference of a circle, which is 2πr, and the area, which is πr², you can see that these both incorporate the radius of the circle in their calculations, similar to how the radius is used in the equation of the circle. When given certain dimensions or related motion problems, you can substitute known values into the equation to solve for the unknowns.

For example, if a circle has a radius of 5 units and its center is at the point (3,4), the equation would be (x - 3)² + (y - 4)² = 25. To find equations related to circular motion, like in the scenario of a student on a merry-go-round, knowing the radius also allows for determining the angular velocity and the velocity of a shadow or any point moving in circular motion.

Given f(x) =10x-2x find f(7)

Answers

replace x with 7
 10(7) -2(7)

70 - 14

56

f(7) = 56

what’s the inverse of y=4x^2-2

Answers

Interchange the x and y and solve for the resulting y.
x = 4y^2 - 2
(x + 2) = 4y^2
(x + 2)/4 = y^2
+/- sqrt(x + 2)/2 = y

The graph of these two is below.

The original is in red
The inverse is in blue and green

Emily’s pet snake is 5 feet long. Kristen’s snake is 50 inches long. Kristen says her snake is much longer because 50 is so much bigger than 5. Is Kristen right? Why or why not?

Answers

kristen is wrong because 50 inches as feet is 4 feet and 2 inches so therefore emily snake is longer

PLEASE HELP ME ON THIS QUESTION AND DON'T FORGET TO EXPLAIN!!!

Please show ur work and correct answer will get brainliest

Answers

Here is one answer that's possible
f(x) [3rd one down] added to the middle g(x) should give you h(x)
f(x)_down 3 + g(x)_middle_g(X)_second column = -2x + 3 + 7x - 9 Now collect the like terms.
f(x) + g(x) = 5x - 6 which is h(x).

These guys sure believe in reading problems. 
 

find the approximate surface area of a bowling ball with a raius of 5 inches

Answers

The surface area would be 100 pi, or rounded to 314.159.

Formula for the surface area of a sphere:  SA  =  4·π·r2

Formula for the volume of a sphere:  V  =  (4/3)·π·r3

Surface area to volume ratio: ( 4·π·r2 ) / ( (4/3)·π·r3 )  =  3 / r

Radius = 5   --->   3/5

39 is 75% of what number

Answers

Hi!

IF 39 is 75%, divide 39 by 3. 

39/3= 13

Multiply that by 4. 

13*4= 52 

39 is 75% of 52. 

Have a nice day! 

Convert -1.2 repeating as a mixed number

Answers

I believe that the answer is -1 and 2/10ths not 100% but I hope that this helps
I actually don't know this one sorry

Which equation finds the value of x in the triangle below?

Answers

we have that

1) cot 70=x/12

Cot 70=[opposite side]/[adyacent side]=x/12

The option 1 is correct

2) cot 70=12/x

Cot 70=[opposite side]/[adyacent side]=x/12

The option 2 is not correct

3)sec 20=x/12

Sec 20 =1/cos20

Cos 20==[opposite side]/[hypotenuse]=12/z

1/(1/cos20)-------> 1/(12/z)------> z/12

The option 3 is not correct

 
4) sec 20=12/x

Sec 20 =1/cos20

Cos 20==[opposite side]/[hypotenuse]=12/z

1/(1/cos20)-------> 1/(12/z)------> z/12

The option 4 is not correct


the correct value is
1) cot 70=x/12



Answer:

A:  cot 70 degrees = x/12

Step-by-step explanation:

on edg... Good Luck!!!

The mean weight of five complete computer stations is 167.2 pounds. The weights of four of the computer stations are 158.4 pounds, 162.8 pounds, 165 pounds, and 178.2 pounds respectively. What is the fifth computer station?

Answers

The mean weight of five complete computer stations is 167.2 pounds.

The weights of four of the computer stations are 158.4 pounds, 162.8 pounds, 165 pounds, and 178.2 pounds.

We have to determine the weight of fifth computer station.

Let the weight of fifth computer station be 'x' pounds.

Mean is calculated by sum of all the observations divided by the total number of observations.

So, [tex] \frac{158.4+162.8+165+178.2+x}{5}=167.2 [/tex]

[tex] \frac{664.4+x}{5}=167.2 [/tex]

[tex] {664.4+x}=167.2 \times 5 [/tex]

[tex] {664.4+x}=836 [/tex]

x= 171.6 pounds

The weight of fifth computer station is 171.6 pounds.

Final answer:

To find the weight of the fifth computer station, subtract the sum of the weights of the four given stations from the mean weight.

Explanation:

The mean weight of five complete computer stations is 167.2 pounds. To find the weight of the fifth computer station, we can calculate the sum of the weights of all five stations and then subtract the sum of the weights of the four given stations. The weight of the fifth station can be found by subtracting the sum of the weights of the four given stations from the mean weight.

Sum of the weights of all five stations = 5 * 167.2 pounds

Sum of the weights of the four given stations = 158.4 pounds + 162.8 pounds + 165 pounds + 178.2 pounds

Weight of the fifth station = Sum of the weights of all five stations - Sum of the weights of the four given stations

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Triangle ABC was dilated and translated to form similar triangle A'B'C'.



What is the scale factor of the dilation?

A. 1/5
B. 2/5
C. 5/2
D. 5/1




Answers

Dilation refers to a non rigid motion where a figure is transform and its image has the same form but a different size measure.

On this exercise is asked to find the scale factor by which the triangle ABC was 
dilated to produce the triangle A'B'C'. 
Dilation is define by the rule (x,y)-- (kx, ky) where k represents the scale factor.

As can be see on the picture the dilation produce was an enlargement meaning that the image is larger that the preimage.
Of this form you can discard the choices A and B as possible solutions.

Lets try 5/2 as the possible scale factor:
(x,y)-- (kx, ky)
A(0,2)--(5/2(0),5/2(2))=A'(0,5)
B(2,2)--(5/2(2),5/2(2))=B'(5,5)
C(2,0)--(5/2(2),5/2(0))=C'(5,0)

Lets try 5/1 or 5 as the scale factor:
A(0,2)--(5(0),5(2))=A'(0,10)
B(2,2)--(5(2),5(2))=B'(10,10)
C(2,0)--(5(2),5(0))=C'(10,0)

As said at the beginning of the question the triangle was not only dilated.
After a dilation and a translation, the scale factor of the dilation is letter C or 5/2.  

correct answer is 5/2

For a school group, a skating rink charges a flat fee of $50 for skates for the students to use the skating rink.
•For 40 Students the skating rink charges 180.
•For 75 students, the skating rink charges 293.75
Which question represents the amount the skating rink charges for x students?
A)y=3.25x+35
B)y=3.25x+ 50
C)y=4.50x+ 35
D) y=4.50x+ 50

Answers

The function has a variable part and a fixed part.
That fixed part is given by the fee for skates, which is $50.
The variable part depends on the quantity of students which is called 'x'. For this part, you are provided with a couple of points where the linear function passes by, they are: A(40,180) and B(75,293.75).

So, first thing to do is getting the slope:
[tex]m= \dfrac{293.75-180}{75-40} = \dfrac{113.75}{35} \\ \\ m=3.25[/tex]

Linear function structure is:
[tex]y=mx+b[/tex]
Where b is the y-intercept, which in this case is the fixed part, 50.
Finally, the function is:
[tex]y=3.25x+50[/tex]

Attached picture shows its graph.

Tim predicts he will get 98 points on the next exam. If Tim actually earned 62 points, what was Tim's percent error? Round your answer to the nearest tenth of a percent.

Answers

% change= (new # - original #) ÷ original # x 100

original #= 98
new #= 62

% change= (62-98)/98 x 100
= -36/98 x 100
= -0.36734 x 100
= -36.73%

Rounded to nearest 10th of %= -36.7%

CHECK:
= 98 - (98 * 36.73%)
= 98 - (98 * 0.3673)
= 98 - 36
= 62 new #

ANSWER:
Her percent error was 36.7% (rounded to the nearest tenth of a percent). The negative indicates a decrease.

Hope this helps! :)

Answer: 58.1

Step-by-step explanation:

98 - 62 / 62 = rounds to 58.1 Thank me Later..

Which function has a domain of all real numbers except x=π/2 ±nπ?

A. y=secx
B. y=cosx
C. y=1/sinx
D. y=cotx,

Answers

A. y=secx This problem deals with the various trig functions and is looking for those points where they are undefined. Since the only math operations involved is division, that will happen with the associated trig function attempts to divide by zero. So let's look at the functions that are a composite of sin and cos. sin and cos are defined for all real numbers and range in value from -1 to 1. sin is zero for all integral multiples of pi, and cos is zero for all integral multiples of pi plus pi over 2. So the functions that are undefined will be those that divide by cos. tan = sin/cos, which will be undefined for x = π/2 ±nπ cot = cos/sin, which will be undefined for x = ±nπ sec = 1/cos, which will be undefined for x = π/2 ±nπ csc = 1/sin, which will be undefined for x = ±nπ Now let's look at the options and pick the correct one. A. y=secx * There's a division by cos, so this is the correct choice. B. y=cosx * cos is defined over the entire domain, so this is a bad choice. C. y=1/sinx * The division is by sin, not cos. So this is a bad choice. D. y=cotx, * The division is by sin, not cos. So this is a bad choice.

Answer:

y=cos x

Step-by-step explanation:

A P E X

helpppppppppppppppppppp

Answers

For this case, the first thing to do is to see the behavior of the function when evaluating some values.
 For the function:
 y = exp (x) -4
 We see that for x = 0 we have:
 y = exp (0) -4
 y = 1-4
 y = -3
 Which is consistent with the graph.
 Answer:
 y = exp (x) -4
 option 4

Lines AB and CD are parallel. If the measure of W equals 129°, what is the measure of X?

Answers

30 is the answer of x

PLEASE HELP ASAP!!! WILL GIVE BRAINLIEST!!!

Two florist purchased flower bouquets and vases at the same store. The first florist bought 2 flower bouquets and 2 vases for a total of $12.50. The second florist bought 8 flower bouquets and 2 vases for a total of $29.00.

Let b represent the cost of one flower bouquet and v represent the cost of one vase. Write AND SOLVE a system of equations to find the price of each type of arrangement. SHOW ALL WORK!

THANKS FOR ALL YOUR HELP

Answers

2f + 2v = $12.50
8f + 2v = $29.00

-2f. - 2v = -12.50
8f + 2v = 29.00

6f = $16.50

f= $2.75 each flower bouquet

2(2.75) + 2v = 12.50

5.50 + 2v = 12.50

2v = $7.00

v = $3.50 each vase

Evaluate the expession. x=12, y=8, z=3 4x-yz

Answers

Given:
 x=12,  y=8, z=3

4x-yz = 4(12) - (8)(3)
4x-yz = 48 - 24
4x-yz = 24

The value of the given expression is 24.

The given expression is 4x-yz.

What is an expression?

An expression is a combination of terms that are combined by using mathematical operations such as subtraction, addition, multiplication, and division.

Put, x=12, y=8 and z=3 in the given expression, we get

4x-yz = 4×12 - 8×3

= 48 - 24

= 24

Therefore, the value of the given expression is 24.

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A high school student working part-time as a pizza delivery man had a gross income of 6324 last year. If his federal tax rate was 10% and his state tax rate was 4.2% what was the amount withheld from his pay last year in fenderal tax, state tax, and FICA combined

Answers

$1381.79 is the answer

Answer:

$1381.79 withheld from his pay last year.

Step-by-step explanation:

A student working as a pizza delivery man and earned = $6324.00

first we calculate all the taxes at the given tax rates

Federal Tax Rate = 10% of 6324.00

= 0.10 × 6324 = $632.40

State Tax Rate = 4.2% of 6324.00

= 0.042 × 6324 = $265.608

FICA is comprised of taxes for social security and medicare. For social security tax rate is 6.2% and for medicare tax rate is 1.45% which add up to 7.65%.

FICA combined Tax Rate = 7.65% of 6324.00

= 0.0765 × 6324 = $483.786

Now we add all the taxes to get what amount withheld from his pay

= 632.40 + 265.608 + 483.786 = $1381.79

$1381.79 withheld from his pay last year.

Which of the following is the image of A after a rotation of -90° about the origin?

(0, -2)
(0, 2)
(-2, 0)

Answers

A would be located at (0,-2)

Answer:

Option A. (0, -2)

Step-by-step explanation:

In the given graph coordinates of point A are (2, 0).

Now this point is rotated by -90° about the origin, that means rotation has been done clockwise by 90°.

Now after rotation this point A will lie on the negative side of the y-axis and the new coordinates become (0, -2).

Therefore, option A. (0, -2) is the correct option.

Trey wants to plant grass in his backyard. His backyard is in the shape of a rectangle. Its length is 31
feet and its width is 24
feet. Suppose each pack of seed covers 12
square feet. How many packs of seed will he need to cover the backyard?

Answers

The first step to solve this problem is to compute for the area of the rectangular backyard. The formula in computing the area of a rectangle is:

A = LW

Substituting the given measurement to the formula:

A = 31 (24)

A = 744 square feet

The area of the backyard is 744 square feet.

Since each pack of seed covers 12 square feet, you need to divide this to the total area of the backyard.

Therefore, you need 62 (744 / 12) packs of seed to cover the backyard.

Final answer:

Trey will need 62 packs of seed to cover his backyard.

Explanation:

To find the number of packs of seed Trey will need to cover his backyard, we need to calculate the total area of the backyard and then divide it by the area covered by each pack of seed.

The formula to find the area of a rectangle is length x width. For Trey's backyard, the length is 31 feet and the width is 24 feet, so the area is 31 x 24 = 744 square feet.

Each pack of seed covers 12 square feet, so we divide the total area of the backyard by the area covered by each pack of seed: 744 / 12 = 62 packs of seed.

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Help please been stuck on this for a week.

Answers

They give the formula as:
Surface Area = (2 • π • r²) + (2 • π • r • height)
However the 2*PI*r^2 part of the formula is used to calculate the 2 "ends" of a cylinder.  Since the problem states that you are NOT to count any of surface area of the "ends" then you only need the (2 • π • r • height) part of the formula.
So, r = 3 inches and height = 8 * 3 inches, the side area equals
2 * PI * r * height
2 * 3.14159 * 3 * 24 =

452.39 cubic inches which is the lateral area.



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