exam Maths Puzzle Numerical Ability

Determine the domain
f(x) = 9-8x-x^2

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exam Other Question

Soccer game.

There were 1000 more students at the soccer game than nonstudents. Student tickets were $8.50 and nonstudent tickets were $13.25. If the total revenue for the game was $75,925, then how many tickets of each type were sold? Solve the following problems.
What expression raised to the fourth power is 81x^12y^8z^16 ?