Rob has 40 coins, all dimes and quarters, worth $7.60. how many dimes and how many quarters does he have?

Which of the following three dimensional figures has a circle as it’s base

Type the correct answer in the box. consider the system of linear equations below. rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.

Solve for x where 0 equation: cot^2x+2cotx+1=0