Expressions and perimeters
write 3 different expressions
that could be used to find
the perimeter of the rectangle
below, uşe each to solve for x
if the perimeter of the
rectangle is 42.

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?