A certain game involves tossing 3 fair coins, and it pays 21¢ for 3 heads, 10¢ for 2 heads, and 7¢ for 1 head. Is 10¢ a fair price to pay to play this game? That is, does the 10¢ cost to play make the game fair?
The 10¢ cost to play a fair price to pay because the expected winnings are
(Type an integer or a fraction. Simplify your answer.)

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Ineed to know the answer to this algebra question.

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?