Olive has read 79 pages on her book. which equation shows how many more pages she has to read? t = total number of pages r = how many more pages she has to read a. t + 79 = r b. r - 79 = t c. t - 79 = r

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?