3. The function c(d) = 50 – 2.5d represents how much money have in my cafeteria
account, c, after d days of eating lunch in
the cafeteria. Evaluate c(10) and interpret
its meaning

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.