If I wakes for 1/2 an hour, walks for 1/3 of an hour, and jogs for 1/4 of an hour. Calculate how many minutes i exercises.

please someone help me this is for a test ​

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?