exam Maths Puzzle Numerical Ability

What is 18 cm/h an example of?
a. speed
b. velocity
c. acceleration
d. momentum

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Please help me with question. I do not understand it at all. Thanks so much for your help.

Find the indicated outputs for f(x)=2xto the second power -2x
f(0)=
f(-1)=
f(2)=

thanks again for the help.
im sorry if i could get help on this last problem thanks alot!
which product of factors is equivalent to (x+1)-y? (please note there is a little 2 over on top next to the 1 out of the paranthesis and another little 2 over the y ? THANK YOU AGAIN.