exam Maths Puzzle Numerical Ability

Use the equation of the regression line to predict y when x = 20.

x = 5 8 6 10 12 9
y = 18 20 15 25 30 25

What answer would be correct?
45.5
50

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exam Other Question

Prove that for any sets A and B, if A is a subset of B, then A(upside-down U)B = A and A U B = B.
Thanks in advance for your help!
use the properties of logarithms to expand the expression


log 3squareroot x/5