exam Maths Puzzle Numerical Ability

Subtract
4x^2 - 5x from the sum of 9x^2 - 2 and 6x - 1.

This is my answer is it right?
-5x^2 - x + 1

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exam Other Question

The population P of a certain culture is expected to be given by a
model P = 100 ert where r is a constant to be determined and t is a
number of days since the original populatio
8cm
12cm