exam Maths Puzzle Numerical Ability

how would I solve for f1 in an equation that is V=speed(f1-f0)/(f1+f0). what is the equation for f1

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exam Other Question

I am having trouble understanding how to distribute the negative number. Please explain. The monthly profit P (in dollars) that Jim makes on the sale of x mobile homes is determined by the formula P = x2 + 5x - 50. Find the values of x for which Jim makes profit.