Would like to know how to solve -7(x-4y-9z)

A50% increase followed by 33 1/2% decrease

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?

How do you write a paragraph proof to prove that the corresponding angles shown are congruent