The number of ways in which 10 contestants in a talent competition can finish

Me! last question, and i'm stuck! write the algebraic expression that models the word phrase. the product of 2 divided by the number h and 8 more than the number k

Donald has x twenty-dollar bills and 11 ten-dollar bill. how much money does donald have? write your answer as an expression.

Acircle has a circumference of 7.850 units. what is its radius?