On October 1, Vista View Company rented warehouse space to a tenant for $4,000 per month. The tenant paid five months' rent in advance on that date, with the lease beginning immediately. The cash receipt was credited to the Unearned Rent account. The company's annual accounting period ends on December 31. The adjusting entry needed on December 31 is:

When a company produces and sells x thousand units per week, its total weekly profit is p thousand dollars, where upper p equals startfraction 800 x over 100 plus x squared endfraction . the production level at t weeks from the present is x equals 4 plus 2 t. find the marginal profit, startfraction dp over dx endfraction and the time rate of change of profit, startfraction dp over dt endfraction . how fast (with respect of time) are profits changing when tequals8?