Erica bought 3 1/2 yards of fabric . if she uses 2/3 of the fabric to make a curtain how much will she have left?

Kevin's bank offered him a 4.5% interest rate for his mortgage. if he purchases 3 points, what will be his new rate?

Prove that 16^4-2^13-4^5 is divisible by 11.

Find the equation of the ellipse with the following properties. the ellipse with foci at (0, 6) and (0, -6); y-intercepts (0, 8) and (0, -8).edit: the answer is x^2 over 28 + y^2 over 64 = 1