Acell phone company charges $40 per month for unlimited calling, and $0.20 per text message sent. if t represents the number of text messages roxy sent last month, which expression represents the cost of her bill last month before any taxes or additional fees? 40 − 0.2t (40 + 0.2)t 40 + 0.2t (40 − 0.2)t

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?