At a used book store, you can purchase two types of books. You can use the expression 3h + 2p to find the total cost for h hardcover books and p paperback books. What is the total cost, in dollars for 6 hardcover books and 4 paperback books?

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,