Which of the following is a type of face found on a platonic solid?
a. right triangle
b. isosceles triangle
c. acute triangle
d. equilateral triangle

Use addition and subtraction to simplify the following polynomials. a. add polynomials: (3 – 4x + 8x^2) + (–6 + 2x – 5x^2) step 1: rewrite the polynomials without the parentheses. step 2: write the polynomial in descending order and use parentheses around like terms. step 3: add the like terms identified in step 2 to simplify the polynomial. b. subtract polynomials: (3x – 5 – 7x^2) – (–2 + 6x^2 – 5x) step 1: rewrite the polynomials without the parentheses. remember to multiply each term in the second parentheses by –1. show your work. step 2: write the polynomial in descending order and use parentheses around like terms. step 3: add the like terms identified in step 2 to simplify the polynomial.

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827