Can someone help me with this please?!?

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account

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