I need help on this question plz and thank you
(Question 5 and if you can number 3 as well)

Solve the system of equations y= 3/2 - 1, -x+ y =-3

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi

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