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
Simplify the formula

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exam Other Question

Suppose N=x^+2 models the number ofcases of infection, in millions, of a disease x years from now. Approximately how many years will there be 7 million cases.

I got this 7=x^+2
(-x^2)=(-5)
x=25 find the domain of this function
g(x)=10x