Just determine whether its positive or negative please

Which expression shows the sum of the polynomials with like terms grouped together

Which of the following parabolas opens down?

Afunction, f(x), represents the height of a plant x months after being planted. students measure and record the height on a monthly basis. select the appropriate domain for this situation. a. the set of all positive real numbers b. the set of all integers oc. the set of all positive integers od. the set of all real numbers reset next