Question

Super confused! Please help! Explanation would be amazing, thanks! :)

Answer 1

A = 29°

Explanation:

set

(3x-4) + (9x+17) + (6x-31) = 180

Solve for x

18x - 18= 180

18x = 198

x = 11

So A will be

A = 3x - 4

A = 3(11) - 4

A = 29°

Answer 2

116°

Explanation:

total angle of a triangle: 180°

thus, (3x-4)+(9x+17)+(6x-31)= 180°.

3x-4+9x+17+6x-31= 180°

18x-18= 180°

18x= 198°

x= 198°/18

x= 11°

angle of A: (9x+17)°

9(11)+17= 99+17

= 116°