Write an integer for each situation.

-a deposit of $90
-45 seconds before launch
-580 b. c.
-an elevation of 3,400 ft.

Integer is an any number which can be negative number, positive number or zero. It is not a fractional number.
In deposit of $90 an integer is +90
In case of 45 seconds before launch an integer is -45
In 580 B.C. -580 is the integer 
In an elevation of 3,400 ft, +3400 is an integer