a store is selling two mixtures of coffee beans in one-pound bags. the first mixture has 12 ounces of sumatra combined with 4 ounces of celebes kalossi, and costs $15. the second mixture has 4 ounces of sumatra and 12 ounces of celebes kalossi, and costs $21. how much does one ounce of sumatra and one ounce of celebes cost?

The perimeter of a triangle is 69 cm. the first is 5 cm shorter than the second side. the third side is twice as long the first side. find the length of each side

Arefrigeration system at your company uses temperature sensors fixed to read celsius (°c) values, but the system operators in your control room understand only the fahrenheit scale. you have been asked to make a fahrenheit (°f) label for the high temperature alarm, which is set to ring whenever the system temperature rises above –10°c. what fahrenheit value should you write on the label

Which of the following quartic functions has x = –1 and x = –2 as its only two real zeroes?