The ratio of girls to the total number of students in class is 4 to 7. How many students are girls if class has 21 students in all?

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.

What is the product? a-3/15a × 5/a-3

2and 3 are angles. complementary vertical congruent supplementary