What is the percent increase from $15 to$21

Afruit stand has to decide what to charge for their produce. they need $10 for 4 apples and 4 oranges. they also need $15 for 6 apples and 6 oranges. we put this information into a system of linear equations. can we find a unique price for an apple and an orange?

Select a graph that have an equation with a < 0

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?