Use the distributive property to expand the expression. −13x − (3y − z) + 5 a) −13x − 3y + z + 5 b) −13x + 3y − z − 5 c) −13x − 3y + z − 5 d) −13x − 3y − z − 5

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?