exam Maths Puzzle Numerical Ability

2(4-2r)=-2(r+5)

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exam Other Question

2 x 5^0 – 3^0

would it be 10^0 - 6^0
The sales of a new model notebook computer are approximated by:
S(x)=6000-12000e-x/10, where x represents the number of months the computer has been on the market a