exam Maths Puzzle Numerical Ability

????????? have perpendicular diagonals

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exam Other Question

9q/10 - 3/5q = 3/4 - 1/8

Can someone tell me the steps to solve this?
Can someone help me plot the exponential and logarithmic function f(x)=( (1/5)^x on a graph?




I need help with putting this on a graph. If anyone could help