Four times a number decreased by twelve

let "a number" = x

four times a number = 4(x)

decreased by 12 = -12

4x - 12 is your answer

hope this helps

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,

you forgot an image

step-by-step explanation: