The area of a rectangle is 30+12x what are 3 possibilities for the length and width of the rectangle

Ineed to know the answer to this algebra question.

What is the unit rate of, 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?