The length of a rectangle is 3n + 2 and it's width is n -1. the perimeter of the rectangle is twice the sum of its length and it's width. write an expression that represents the perimeter of the rectangle

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?