CAN SOMEONE PLEASE HELP ME WITH NUMBER 3! MARKING BRAINLIEST!

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.

Find the length of cu, the triangles are similar.

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)