Solve the system of equations by adding. Check your answer. S2x +2y = -6 3x - 2y = 21 The solution of the system is can you help me understand it?​

Look at this expression. a3b3c a-3b-3c-1 which of the following is the simplest form of the expression above?

What is the shape of the height and weight distribution

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