What number could replace k below?
\dfrac{1}{10} = \dfrac{10}{k}

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

The probability that a student graduating from suburban state university has student loans to pay off after graduation is .60. if two students are randomly selected from this university, what is the probability that neither of them has student loans to pay off after graduation?

*let m∠cob = 50°30’, m∠aob = 70° and m∠aoc = 20°30’. could point c be in the interior of ∠aob? why?