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

Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?