Two groups of students were tested to compare their speed working math problems. Each group was given the same problems. One group with calculators, the other group computed without calculators. What is the independent variable, the dependent variable, the control variable, and constant variable?

african americans demonstrated their newly found freedom by relocating often in search of relatives whom they had been separated from during slavery. others established schools to educate freed people and they built institutions such as churches and political organizations to advocate for their rights.

how important do you think an instrument is to the musician who plays it?