A person randomly draws one card and places it back in the deck. He then draws another card. What is the probability that a number card is drawn in both events?

How can you construct perpendicular lines and prove theorems about perpendicular lines

List x1, x2, x3, x4 where xi is the midpoint endpoint of the five equal intervals used to estimate the area under the curve of f(x) between x = 0 and x = 10.

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.