100*/*per hour

Usually replies in 7 hours

Calculus
| 10 other subjects

50*/*per hour

Usually replies in 3 hours

Calculus, Linear Algebra
| 6 other subjects

45*/*per hour

Calculus, Linear Algebra
| 8 other subjects

100*/*per hour

Usually replies in 1 hour

Calculus, Linear Algebra
| 10+ other subjects