55hr

55*/*per hour

Usually replies in 3 hours

Mathematica
| 10+ other subjects

40hr

40*/*per hour

Usually replies in 7 hours

Mathematica
| 2 other subjects

75hr

75*/*per hour

Usually replies in 2 hours

Offering 38 subjects

30hr

30*/*per hour

Usually replies in 5 hours

Mathematica
| 10+ other subjects