book Maths Puzzle Numerical Ability

Can you help solve this and explain how?

Find the midpoint between these points:
(2, 3) and (8, 1)

Thank you.
Penalope

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book Other Question
How do you perform this operation to its simplest form:
1/x2y.2/xy.3/xy2
The first and the last "2" are exponents
Thanks 10) The year y when sales were s million dollars for a particular electronics company can be modeled by the radical equation
. . . . . ______
y=1.3/s-4-7 (That is the sqrt s