Write and evaluate an expression using addition and multiplication to determine the total number of cups of water used by the 12 students during the experiment. ​Show or explain each step you used to evaluate the expression.
Enter your expression and your work or explanation in the box provided.

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?