Find the measure of the missing angle

A-53
B-67
C-120
D-60

Hiroaki wants to find 3 3/4 - 7/8 explain why he must rename 3 3/4 to do the subtraction.

What is x3+3x2−16x−48 divided by x−1?

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years