PLZ HELP ASAP
2. One load of gravel contains 240 ft2 of gravel. The area A that the gravel will cover is inversely proportional to the depth of d to which the gravel is spread.
a. Write an inverse variation model for the relationship between the area and depth for one load of gravel.
b. A designer plans a playground with gravel 6 in. deep over the entire play area. If the play area is a rectangle 40 ft. wide and 24 ft long, how many loads of gravel will be needed? (4 points)

I understand everything else but this question.

A. y=

B. z= 2

Step-by-step explanation:

A.

The format for the inverse variation formula is y =  

This is a bit different compared to the format of directly variation formula y= kx

In this case, one load of gravel have volume. The area is inversely proportional with depth, so formula for the volume is Area x Depth (V= A x D). The inverse variation formula will be: A= V/D

If the number of loads=z, each load is , area = y and depth = x , then the model will be:

y=

y=

B.

The play area is  a rectangle 40 ft wide and 24 ft long, then the area will be: area = 40ft * 24ft= 960

We have area(y= 960 ) and depth(x= 6 in- 0.5 ft) , now we can find out the number of loads needed(z) by using the equation.

y=

960 =

= 960

z= = 2

1.0

step-by-step explanation:

the correct answer is b. negative exponential growth.

step-by-step explanation:

you can tell it's an exponential function because it decreases rapidly then levels out and never touches the x-axis.

it is negative because the y-axis decreases as the x-axis increases.

therefore it is a negative exponential growth graph.

hope i !