exam Maths Puzzle Numerical Ability

Please graph the following. Thanks for any help.

f(x) = -2x + 1 and its inverse

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exam Other Question

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. Keith weighs 20 kg more than Beth, while Henry weighs 30 kg less than twice as much as Beth. If Keith and Henry weigh the same, how much does Beth weigh (in kg)?