exam Maths Puzzle Numerical Ability

Please write the following with steps

Draw a graph of each function by first writing an equivalent exponential form and then making a table of values

I am only having trouble with writing an equivalent exponential form

y = log2x

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exam Other Question

I have to find the equation for a problem that th oil spill spreads 7 kilometers in length and 3 kilometers in width. What would the equation be? What is the way to solve a basic equation? There are lots of steps, and I dont get them.
for example, what are the steps to solving the following equation:

2x + -10 = 10 + -3x

And can you explain the "why" in every step?