The fastest time so far is 3 minutes and 21 Seconds! Can you do faster?!

Q1: Differentiate y=3x^-2

f(x)-->(3x-2)/(x+2)

Q2: Find f '(x)

Q3: Find f '(2)

Q4: Solve x+y=8

x^2+y^2=34

Q5: Solve (1/x)+(1/y)=12

(1/x)-(1/y)=2

f:x-->2x+5, g:x-->(1/2)x

Q6: Find f(g:x)

Q7: Find g(f:x)

See how fast you can do these 7 questions! Post answers for other people who don't know these stuff