859. <span>Because it rounds to 900, it must be somewhere between 850-899. The fifth odd number you count beginning with 1 is 9 (1, 3, 5, 7, 9). That leaves 859, 869, 879, 889, and 899. Then use a calculator to add them up, and 859 is the only one that adds up to 22.</span>
For this case, the first thing we are going to do is define the following variable: x = unknown number We now write the following inequality: 5-3x <= 11 We clear x: 5-11 <= 3x -6 <= 3x -6/3 <= x -2 <= x The solution set is: [-2, inf) Answer: the solution set is: [-2, inf)
