exam Maths Puzzle Numerical Ability

Explain how you might find a measure of an angle of a staircase that will describe the staircase's steepness.

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How do you solve F(x)=x+2 and g(x)=x^2

This is not in the textbook . The questions were written on the board.
x=Years up to 1995
y=# of prescriptions

x
0(1995)
8(2003)
10(2005)

i am trying to answer a). it says to find the approximate number of prescritpions in the yea