A boy throws a rock off a cliff. The function shown below models the flight of the rock, where x equals the distance the rock is from the cliff in yards. How far from the cliff is the rock when it hits the water?

f(x) = -x^2 + 4x + 12

one that is bigger than 3 1/2

answer:  

step-by-step explanation:

here x represents the height of the pole,

and, the height of the shadow of the pole is 12 feet.

also, the angle of elevation from the top of the pole is 40°,

therefore,

by the low of sine,

which is the required equation for finding the value of x,

c: lkllmn.

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