exam Maths Puzzle Numerical Ability

in a stack of books 81 cm high, we have a total of 21 books. there are 5 cm thick and others of 3 cm thick. how do we each thickness?

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Draw a coordinate plane and place the point (6,-14) on the graph. Label it

thank you Let R(x)=x^3-7/x^2+1; what happens to R(x) if we now have R(x+2)?
a)It shifts 2 units to the left
b)It shifts 2 units up
c)It shiftes 2 units to the right
d)It remains stationary; there is no effect of adding 2 to x