exam Maths Puzzle Numerical Ability

One-third of a number, decreased by 1 is 8.
What is the number?

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exam Other Question

The table shows several values of the function f(x) = -x^3 +x^2 - x + 2. Use the values and the intermediate value theorem to determine (an) interval(s) wher ethe function must hav solve for x
log2x + log2(x^2-9) = log2(-5x)