exam Maths Puzzle Numerical Ability

this is easy i know but it is a practice problem for an exam and iam drawing a blank.
4+2p=3p thanks

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(20b^3+17b^2+22b+48)(divided by)(4b+5)the answer I got was 5b^2-2b+8+8/4b+5 Use the geometric sequence of numbers 1, 1/2, 1/4, 1/8,...to find the following:

a) What is r, the ratio between 2 consecutive terms?

b) Using the formula for the sum of the