exam Maths Puzzle Numerical Ability

I need help with this problem: ((-2f))) f= 3/4

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exam Other Question

Rewrite 5π/4 radians in degree measure. 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?