a company sells circular mirrors. the price P pounds is proportional to the square of its radius r cm. a mirror with radius 20cm has a price of £36. find a formula for p in terms of r

P = 0.09r²

Step-by-step explanation:

Price, p is proportional to the square of its radius, r

P = k*r²

a mirror with radius 20cm has a price of £36

P = k * r²

36 = k * 20²

36 = k * 400

36 = 400k

k = 36/400

k = 0.09

Substitute the value of k into the equation:

P = k * r²

P = 0.09 * r²

P = 0.09r²

answ9x x 3=

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 !