exam Maths Puzzle Numerical Ability

find the length of a rectangle if it is four less than twice the width and the perimeter is 40 cm

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exam Other Question

Evaluate x^2y^3 / /x^2 + y^2 when x = 6 and y = -8.


CANT SHOW ANY WORK ON THIS ONE CUZ I HAVE NO CLUE???
Evaluate Functions

Evaluate the functions for the values of x given as 1, 2, 4, 8, and 16. Describe the differences in the rate at which each function changes with increasing v