60*/*per hour

Usually replies in 15 hours

Calculus
| 10+ other subjects

70*/*per hour

Usually replies in 7 hours

Calculus, Linear Algebra
| 10+ other subjects

150*/*per hour

Usually replies in 2 hours

Calculus, Linear Algebra
| 10+ other subjects

50*/*per hour

Usually replies in 3 hours

Calculus
| 10+ other subjects