Mark scored an 88 on his first test, an 84 on his second test, a 94 on his third test, and an 86 on his fourth test.
What is Marks Average test score for all 4 tests?

Answer this question! 30 points and brainliest!

Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?

Solve the formula ax+ by = c for x.