40*/*per hour

Usually replies in 3 hours

Mathematica
| 10+ other subjects

65*/*per hour

Usually replies in 2 hours

Mathematica
| 10+ other subjects

115*/*per hour

Usually replies in 41 minutes

Mathematica
| 10+ other subjects

40*/*per hour

Usually replies in 4 hours

Mathematica
| 10+ other subjects