An equation is simply a number sentence with a variable in the place of an unknown value. A variable is a letter that is substituted in place of the unknown value. It can be any letter you want, although x is most commonly used. To unlock this lesson you must be a Study.com Member.
Midscale, smoke-free hotel near Cedar Rapids Airport 3 floors, 74 rooms and suites-elevator-AAA 2 Diamonds.
The Cedar Rapids Parks Department operated the airport until a new Airport Commission was established in 1945; Donald Hines, who led the effort to build the airport, was the commission's director until he retired in 1973 (he died in 1975).