exam Maths Puzzle Numerical Ability

Multiply.
8pq�(2pq-3p+5q)

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exam Other Question

I can't figure out this problem:

Find S(sub8) and S(sub infinity) for the geometric sequence:
3/4, -1/2, 1/3.

Thanks in advance for your assistance!

V/r,
Loomis circle with equation: X^2 + Y^2 - 6X - 18Y + 45
Tangent touches the circle at point T equation of the tangent is 2Y = X
Show algebraically that T has coordinates (6,3).