If n(X)=200,x)=300 and n(XUY)=400
then
Find the value of n(XnY)

Florence price's brownies and more sells all types of cookies and pastries. on tuesdays, they markdown all brownies 75% to a sale of $1.50 a dozen. find the selling price and the markdown of a dozen brownies.

Solve the following inequalities and show the solution on a number line. 3/4 (2x-7) ≤ 5

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