A triangle has an area of 28 square feet and a base of 7 feet. What is the height of the triangle?

8 feet high

Step-by-step explanation:

A = (B x h) /2  (or x 1/2, it doesn't matter)

28 x 2 /7 = h

28 x 2 = 56

56/7 = 8

8 feet high

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,