How many gallons of a 90% antifreeze solution must be mixed with 70 gallons of 30% antifreeze mixture get get a mixture that is 80% antifreeze? You need to add gallons of the 90% antifreeze solution.
(Round to the nearest whole number.)

Which of the following is true for the relation f(x)=2x^2+1

Asquare has a side that measures 11 units. what is the area of a circle with a circumference that equals the perimeter of the square? use 3.14 for π, and round your answer to the nearest hundredth. 1519.76 units2 379.94 units2 616.56 units2 154.14 units2

Amira is painting a rectangular banner 2 1/4 yards wide. the banner will have a blue background. amira has enough paint to cover 1 1/2 square yards of the wall. the school colors are blue and yellow, so amira wants to add yellow rectangles on the left and right sides of the blue rectangle. the yellow rectangles will each be 3/4 yards wide and the same height as the blue rectangle. what will be the total area of the two yellow rectangles?