Is (2, 9) a solution to this system of inequalities? y > x + 10 y < 4x + 1

Solve the equation x/4 - 5= -8 -27 -12 -7 12

Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g

Which of these figures must be a rectangle?