exam Maths Puzzle Numerical Ability

Use the geometric sequence of numbers 1, 2, 4, 8,�to find the following What is r, the ratio between 2 consecutive terms?

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exam Other Question

Please help me I can not understand this problem this is from a worksheet.And the question is, Rewrite the equation 2x-3x=-6 as a function of x.Thank you in advance. I don't understand how to do this problem.
For the equation x - the square root of x = 0 , perform the following:
Solve for all values of x that satisfies the equation
Thanks