exam Maths Puzzle Numerical Ability

Let R(x)=x^3-7/x^2+1; what happens to R(x) if we now have R(x)-3?
a)It shiftes 3 units to the left
b)It shiftes 3 units down
c)It shiftes 3 units to the right
d)It shiftes 3 units up

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exam Other Question

Observe the following pattern and state a generalization based on the pattern:
1 + 3=2(2)
1 + 3 +5=3(2)
1 + 3 + 5 + 7=4(2)
What number is next in this series? 10, 4, 3, 11, 15 . . .

I chose 14 because 10-4=6; 4-3=1; 3-11=8; 11-15=4; 15-14=1. The series appeared to me to be even, odd, even, even, odd. Is 14 the correct answer?