Ashopper buys 3 notebooks for $5 each. the percent of sales tax is 8%. how much is th sales tax?

i used to know how to do this in 7th but i forget easily

step-by-step explanation:

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,