12. The science teacher bought 20 mousetraps for $59.99. What was the unit cost for each mousetrap?
48 mousetraps
x mousetrans

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,

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value