What is (f-g)(x)? f(x)=x^4-x^2+9 g(x)=x^3+3x^2+12

Mrs. avila is buying a wallpaper border to go on all of her kitchen walls. she wants to buy 5 extra feet of wallpaper border than she needs to be sure she has enough. she buys 55.5 feet of the border. the store owner selling the border uses the width of mrs. avila's kitchen to determine that the length of her kitchen must be 14.5 feet.

Troy has a 7/23 balloon mortgage on his $260,000 home. he has been making payments of $1323 each month and will have a balloon payment due for the amount of $198,569.

The diameter of the moon is about 3500 km. approximate the surface area of the moon using the formula for the surface area of a sphere, s = 4πr^2. write your answer in scientific notation.