How do you group objects together?

When watching the video example 87: function notation, the presenter states that we need to, "go to this function and in the place of x, we will put in " â4 â3 â2 â1?

Ultravision inc. anticipates sales of $280,000 from january through april. materials will represent 50 percent of sales, and because of level production, material purchases will be equal for each month during the four months of january, february, march, and april. materials are paid for one month after the month purchased. materials purchased in december of last year were $24,000 (half of $48,000 in sales). labor costs for each of the four months are slightly different due to a provision in the labor contract in which bonuses are paid in february and april. the labor figures are: january $14,000 february 17,000 march 14,000 april 19,000 fixed overhead is $10,000 per month. prepare a schedule of cash payments for january through april. (assume the $280,000 of sales occur equally over the four months of january through april, i.e. monthly sales = $280,000 / 4.)

Rose bought a mattress for her guest bedroom for $100, on sale. the mattress is nonreturnable. although everyone who has slept on the mattress said it was very uncomfortable, rose will not get rid of it because she spent $100 on it. what psychological factor associated with behavioral economics explains rose's behavior?