3 Math QUESTIONS pls HELP

Brainlest answer can you find the area and circumference of a circle given the radius or diameter? if its yes or no explain why

Select the correct answer from each drop-down menu. consider the following polynomials equations. 3x^2(x-1) and -3x^3+ 4x^2-2x+1 perform each operation and determine if the result is a polynomial. is the result of a + b a polynomial? yes or no is the result of a - b a polynomial? yes or no is the result of a · b a polynomial? yes or no

Which of the following is missing in the explicit formula for the compound interest geometric sequence below?