exam Maths Puzzle Numerical Ability

Question 1:
There are 25 students in Mrs. Brown's class. She has a drawing for 3 prizes. how many differnet groups of three winners are there?

I said 25/3=8.33 then 8.33 squa

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exam Other Question

12.48 In the following regression, X = weekly pay, Y = income tax withheld, and n = 35 McDonald’s

employees. (a) Write the fitted regression equation. (b) State the degrees of f
Find a number which is 150 greater than its opposite.

This just baffles me!!!!
Thanks a bunch!!
Joanne