Enter the missing reasons for the following two-column proof. Given: M is the midpoint of CD;CM = 3x - 10; MD = 6x -22

Prove: x=4

Statement Reason
M is the midpoint of CD;CM = 3x - 10; MD = 6x - 22 1. ?
CM = MD 2. ?
3x - 10 = 6x - 22 Substitution
-3x - 10 = -22 Subtraction Property of Equality
-3x = -12 3. ?
x = 4 Division Property of Equality

Taking algebra two apex courses and need with these questions

The sat and act tests use very different grading scales. the sat math scores follow a normal distribution with mean 518 and standard deviation of 118. the act math scores follow a normal distribution with mean 20.7 and standard deviation of 5. suppose regan scores a 754 on the math portion of the sat. how much would her sister veronica need to score on the math portion of the act to meet or beat regan's score?

Could somebody me with this radical simplification?