Amelia started writing an essay at 7: 15 am. she finished writing at 10: 30 am. how long did it take to finish?

2 hours and 5 minutes
3 hours and 15 minutes
1 hour and 5 minutes
5 hours and 5 minutes

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

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?

Hurry can a triangle can be constructed with angles measuring 115°,55°, and 20°? yes or no