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

Hi,
What are the coordinates of the y-intercept of the graph of y=2/3x-6?
I know that the y=-6, and x=0 but why does it equal zero. Also if the equation looked like y= -6x+2/3? would the answer be (0,-2/3)?
thanks in advance (7 a squared x b cubed) to 1/2 power (7 a squared x b cubed) to negative 1/2 power =