If 8a−4b=20 and 4a−8b=4, then what is the value of a−b?

Write the sentence as an equation. z plus 372 is equal to 160

If the simple annual interest rate on a loan is 6, what is the interest rate in percentage per month?

Abag contains 3 red marbles, 2 blue marbles, and 2 green marbles. one marble is picked, then another marble. assume that the selections are made with replacement. a) find the probability of picking two red marbles with replacement. b) find the probability of picking a red marble and a blue marble. assume the selections are made without replacement. c) find the probability of picking two red marbles without replacement. d) find the probability of picking a red marble and a blue marble without replacement.