exam Maths Puzzle Numerical Ability

In how many different ways can two black cards be drawn from a standard deck of cards? Assume that the order of the cards matters.

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exam Other Question

How do you graph f(x)=2^x and g(x)=log(base)2^x on the TI-83 calculator? Or the inverse of f(x)=2^x on the TI-83 calculator?

Thank you for you time. Here is the problem: " A homeowner constructed a patio 5 feet wide and 12 feet long. The distance on the diagonal was 14 feet. Determine wheater or not the patio has right angles atteh corner; support your answer. Include a diagram.