Amining crew started out 84 ft underground. they took an elevator 123 ft down and then rode mine carts 55 ft back up. how far underground are the miners?

hint: integers

This is so harddd! solve. 1 + 1 = solve 4 + 4 = solve 3 x 3

Find the roots of the equation below. x^2 - 6 + 9 = 0

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b