In a 50-question test, the highest score in the class is three times the lowest score minus four. the difference between the highest score and the lowest score is 30. what is the highest score?

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28