Question

find the value of x.
a. 35
b. 45
c. 10
d. 80

Explanation:

Step1: Set up the equation

The sum of \(2x^{\circ}\) and \(20^{\circ}\) is \(90^{\circ}\) (right - angle). So, \(2x + 20=90\).

Step2: Solve for \(x\)

Subtract \(20\) from both sides: \(2x=90 - 20\), \(2x = 70\). Then divide both sides by \(2\): \(x=\frac{70}{2}\).

Answer:

A. 35