The measures of the angles of △rst are given by the expressions in the table. angle measure r 31° s (x+4)∘ t (3x+9)∘ find the value of x. then find the m∠s and m∠t. enter your answers in the boxes. x = m∠s= º m∠t= º

Because a triangles angles add up to 180 degrees, we can say that 

x+4+3x+9+31=180 degrees.

The question is now a simple algebraic expression.

4x+44=180
Subtract 44 on both sides

4x=136
Divide by 4 on both sides

x= 34

m∠S= x+4, (34)+4, 38
m∠S=38 degrees

m∠T= 3x+9, 3(34)+9, 102+9, 111
m∠T=111 degrees

I hope this helps and please mark brainiest answer :D