exam Maths Puzzle Numerical Ability

Seven men agree with eighth man to subscribe a sum of money to a fund. The first seven are to subscribe Rs.50 each and the eighth man Rs. 70 more than the average of all the eight. Find how much did the eighth man subscribe?

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exam Other Question

Find corresponding y values for x= -2, -1, 0, 1, 2, 3 if
y=x2-x-2
that is x squared
I just really dont understand math at all im having trouble in my algebra2 class with point slope heres a problem can u solve it for me [3,2] [-4,3]