Two angles that can be trisected with a straightedge and compass are and angles.

a.90; 30
b.90; 45
c.60; 45
d.75; 90

The correct option is B.

Step-by-step explanation:

Using the straightedge and compass we can construct the angles which are multiple of 15.

A angle can be trisected with a straightedge and compass if and only if one third of the angle is divisible by 15.

It means 30, 75 and 60 can not be trisected with a straightedge and compass. So options A, C and D are incorrect.

Two angles that can be trisected with a straightedge and compass are 90° and 45° angles. The option B is correct.

answer: 48

just remember to use pemdas:

parentheses

expressions

multiplication

division

addition

subtraction