exam Maths Puzzle Numerical Ability

I'm having some trouble with the following problem.

A fish swims at a speed v relative to the water, against a current of 4.8 mi/h. Using a mathematical model of energy expendi

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exam Other Question

is it possible to use the substitution method to solve a linear system always? what is (2x to the power of 3)to the power of 2 multiplied by
(3x to the power of 4) how would i rewite it to one exponent?

and 5x 5y 3z how would i rewrite it to one exponent?