I have 18 ones, 15 hundred, 15 tens, and 8 thousand. What number am I?

I have 18 ones, 15 hundreds, 15 tens, and 8 thousands. What number am I?

Read the numbers and decide what the next number should be.

5, 15, 6, 18, 7, 21, 8,...

A company produces two types of candy, A and B. Studies in the popularity of these candies show that the number of Type B minus the number of Type A sold (per year) cannot exceed 10,000 units. Also, Type A will not sell more than twice as many units as Type B. The company has a binding contract with a local supplier and has to provide at least 8,000 total units of candy to it each year. Unfortunately, the candy of Type A is popular because it is sold very cheaply, at a loss of $150 per thousand units. The profit on candy B is $120 per thousand units. Let O be the optimal profit for the company, while x and y represent the number of units in thousands) produced of Type A and Type B candies, respectively. 4a) Clearly indicate the objective function in terms of x and y. Simplify your answer. What 3 conditions must be satisfied, in addition to the two obvious ones given below?