40*/*per hour

Usually replies in 2 hours

Mathematica
| 10+ other subjects

68*/*per hour

Usually replies in 24 minutes

Mathematica
| 10+ other subjects

100*/*per hour

Usually replies in 2 hours

Mathematica
| 10+ other subjects

65*/*per hour

Usually replies in 16 minutes

Mathematica
| 10+ other subjects