Which of the following equations have exactly one solution?
Choose all answers that apply:
A 2x - 31 = 2x – 31
B 2x - 31 = -2x – 31
C 2x + 31 = 2x - 31
D 2x - 2 = 20 – 31

Solve each equation using the quadratic formula. find the exact solutions. 6n^2 + 4n - 11

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years

Aright triangle has an area of 21 m2. the dimensions of the triangle are increased by a scale factor of 4. what is the area of the new triangle