1. In a triangle the ratio of two angles is 5:7, and the
third
angle is 72º. What are the
measures of the unknown
angles?

The unknown angles are 45 and 63

Step-by-step explanation:

5x + 7x + 72 = 180 (angle sum property)

12x + 72 = 180

12x = 180 - 72

12x = 108

x = 108/12

x = 9

Therefore, 5x = 5*9 = 45

                7x = 7*9 = 63

f(2x−x2)=−3x2+6x−1

step-by-step explanation:

set up the composite function and evaluate.

f(2x−x2)=−3x2+6x−1