Subtract 30 from both sides.
would it be "-10•3=0-30

(2,9)

i think thats the answer i checked it on google

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,

i got 142 as my answer

step-by-step explanation:

283 square feet

step-by-step explanation:

good luck