The ratio of the number of volleyball to the number of basketballs in the p. e room is 4: 7 .there are 21 basketballs . how many volleyballs are there?

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

Yahir designs bracelets. he uses between 9 and 15 red and yellow beads in the ratio of 2 red bead to 5 yellow beads. drag the beads into the container to meet these requirements

The police chief wants to know if the city’s african americans feel that the police are doing a good job. identify the management problem (i.e dependent variable) and identify the independent variable.