Find the value of X for the triangle.

2x - 20 = 32 20 - 3x = 8 6x - 8 = 16 -13 - 3x = -10

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

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.