Help please. I must submit it by an hour

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

Find the unit rate for: 75% high-fiber chimp food to 25% high -protein chimp food.

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?