exam Maths Puzzle Numerical Ability

How many 3-digit codes using the digits 0 through 9 are possible if repetitions are allowed. Is it 504, 729, 30, 1000. Can you show me how to work this out?

Thank you,

Ellen

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exam Other Question

Suppose the graph of Y=X^3 is shifted to obtain each the following graphs. What is the equation of the function, g(x), for each graph? WHEN (Y,X) IS (-4,1.5) AND THE SECOND GRAPH I what is the square root of
a^2-10a+25