exam Maths Puzzle Numerical Ability

Science and medicine. The combined resistance of two resistors R1 and R2 in a parallel circuit is given by the formula.

R1= 1
---------
1 + 1
---- ----
R1 R2

Simplify Formula.

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exam Other Question

The inverse of f(x) = 3x + 5 is f^-1(x) =

a. (x - 5)/3
b. (x - 3)/5
c. (x + 5)/3
d. (x + 3)/5
e. none of these use synthetic division to show that the number given to the right of the equation is a solution of the equation, then solve the polynomial equation.
x^3+2x^2-11x-12=0;-4

a){3,1,-4}
b){3.-1.-4}
c){-3,1,-4)
d){-3,-1,-4}