Write the following proportion using colons. 7 is to 21 as 3 is to 9.

a. 7: 21 = 9: 3
b. 7: 3 = 21: 9
c. 21: 7 = 3: 9
d. 7: 21 = 3: 9

Noor brought 21 sheets of stickers. she gave 1/3 of a sheet to each of the 45 students at recess. she wants to give teachers 1 1/2 sheets each.

Suppose your school costs for this term were $4900 and financial aid covered 3/4 of that amount. how much did financial aid cover? and how much do you still have to pay?

Koji is installing a rectangular window in an office building. the window is 823 feet wide and 534 feet high. the formula for the area of a rectangle is a=bh. what is the area of the window? enter your answer as a mixed number in simplest form in the box. $$ ft2