Question

Please help me and explain how to do it

Answer 1

<A = 50

Explanation:

The sum of the angles of a triangle are 180

<A + <B + <C = 180

2x-10 + 70 + x+30 = 180

Combine like terms

3x +90 = 180

Subtract 90 from each side

3x+90-90 = 180-90

3x= 90

Divide each side by 3

3x/3 =90/3

x = 30

We want <A = 2x-10

=2(30)-10

=60-10

=50