Suppose that 5% of the time Danny attends a concert twice a week, 45% of the time he attends a concert once a week, and 50% of the time he doesn't attend a concert at all in a given week. What is the expected value for the number of times Danny attends a concert during a week

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?