exam Maths Puzzle Numerical Ability

if f(x)=2x to the second powerand g(x)=x to the second power - 3 find (f g)(x)

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exam Other Question

1/R= 1/R1 + 1/R2 SOLVE THE EQUATION FOR R1 IN TERMS OF R AND R2.

i KNOW the first step is to isolate 1/r1

1/r-1/r2=1/r1

my guess is r1= (r-r2)/r*r2 The president of a company producing water pumps has gathered data suggesting that the average cost in dollars of producing x units per hour of a new style of pump will be C(x)=x s