exam Maths Puzzle Numerical Ability

Could I get some help with this problem please?

Subtract using the vertical method- 7x^2 + 6x from 9x^2 - 3.

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exam Other Question

edward is a salesman. his annual base salary is $30,000. he receives 2.5% commission on each sale, if he wanted to make $55,000 how much would he have to reach in sales? rewrite 10x-5y=15,so that y is a function of x.