exam Maths Puzzle Numerical Ability

please help me with this

Find the reciprocal of [-1/5](15)

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exam Other Question

I need help with graphing Logarithmic function. What would this look like on a graph.

f(x)=(1/5)^x

HELP!!! I need assistance on this function. Your help is greatly appreciated. Explain the following in your own words: (a + b)^2 is not equal to a^2 + b^2. Give a numerical example to illustrate this.