exam Maths Puzzle Numerical Ability

F(x)=3x-5 and g(x)=1-x^2
find (FoG)(x) and (GoF)(x)

A line passes through the points (7,-3) and (1,3),find the standard form of the line(ax+by=c)

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exam Other Question
1. Please explain why a series is a function.

2. Show a graph of the arithmetic series: 2, 4, 6, ...

3. Show a graph of a geometric series.

4. How can arithmetic and geom 8.) a^2 - b^2-c^2-2bc / a^2 + b^2-c^2-2ab

please explain this to me...
i tried factoring by grouping and ended up with a completely wrong answer on my worksheet ):