exam Maths Puzzle Numerical Ability

simplify:

(3x^3 - 1 + 9x) + (3 + 3x)

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exam Other Question

At Jones Realty each sale of a house results in 6% of the selling price being paid to the business. The selling agent then receives 60% of that amount as commission. If an agent sells a house for $225,000, what is the commission on the sale? in 1993, the life expectancy of males in a certain counrty was 71.3 years. In 1999, it was 73.7 years. Let E represent the life expectancy in years t and let t represent the number