exam Maths Puzzle Numerical Ability

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!

Read Solution (Total 0)

exam Other Question
Bob owns a watch repair shop. He has found that the cost of operating his shop is given by c(x)=4x^2-304x+71, where x is the number of watches repaired. How many watches must her repair to have the lowest cost?

Thanks. 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