Someone please please help DUE in THIRTY MINUTES
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What is sin 7x/4 ? i need on this urgent trig

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?

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?