I need help being explained the general meaning of what I should be doing.

the question using the following data, which show all available techniques for producing 20 units of a particular commodityresource resource prices possible production techniques#1 #2 #3 #4 #5land $4 2 4 2 4 4labor 3 1 2 4 1 3capital 3 5 2 3 1 2entrepreneurial ability 2 3 1 1 4 1assuming that the firm is motivated by self-interest and that the 20 units that can be produced with each technique can be sold for $2 per unit, the firm will

Arival company manufactures fuel tanks for cars using a different production technique. the total weekly cost (in dollars) of producing x tanks is given by c(x) = 10000 +90x - 0.04x2 find the marginal cost at a production level of 500 fuel tanks per week to approximate the cost of the 501st unit (round to the nearest 2 decimal places, if needed)

On july 1, oura corp. made a sale of $ 450,000 to stratus, inc. on account. terms of the sale were 2/10, n/30. stratus makes payment on july 9. oura uses the net method when accounting for sales discounts. ignore cost of goods sold and the reduction of inventory. a. prepare all oura's journal entries. b. what net sales does oura report?