exam Maths Puzzle Numerical Ability

I need help simplifying the expression (2/3a)(3/2b)

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exam Other Question

Find values for m and b in the following system so that the solution to the system is (-3, 4).

5x + 7y = b
mx + y = 22

Thank you for your help. please help

The rational function: C(x)= 140x/100-x, 0<x<100 describes the cost, C, in millions of dollars, to innoculate x% of the population against a particular strain of the