Check all of the points that are solutions

Can someone me with the property questions for 12 13 and 14 plz

In the sixth grade 13 out of 20 students have a dog if there are 152 sixth grade students how many of them have a dog

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