jannette can repair a refrigerator in 60 minutes. liza can repair a refrigerator 20 minutes faster. if they work together, how many minutes does it take them to repair the refrigerator?
a.) 120
b.) 40
c.) 24
d.) 20

a) 15/7

step-by-step explanation:

in mathematics, a function is a relationship between two variables such that the value of one of the variables, called the dependent variable, is determined by the value of the other variable, called the independent variable. there is a specific term we use to describe the set of independent variables of a function.