What is the surface area of the sqare meters 3m 7m 7m

What is x and y (use substitution? ) 5x+3y=38 and y=3x+8?

What is the equation and solution for the sentence? the sum of a number and thirty-one is one hundred thirteen. write the equation as n-31=113 and subtract 31 from both sides. the answer is 82. write the equation as n+31=113 and subtract 31 from both sides. the answer is 82. write the equation as n+31=113 and add 31 to both sides. the answer is 144. write the equation as n-31=113 and add 31 to both sides. the answer is 144.

Combine like terms to make a simpler expression 3z+z