Please help:P trig is confusing

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?

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a

What percent of 18 is 24? and plz explain thx.