A firm's cost curve is C = F + 10q - bq^2 + q^3, where b>0.

a. For what values of b are cost, average cost, and average variable cost positive? (From now on, assume that all these measures of cost are positive at every output level.)

b. What is the shape of the AC curve? At what output level is the AC minimized?

c. At what output levels does the MC curve cross the AC and the AVC curves?

The blumer company entered into the following transactions during 2012: 1. the company was started with $22,000 of common stock issued to investors for cash. 2. on july 1, the company purchased land that cost $15,500 cash. 3. there were $700 of supplies purchased on account. 4. sales on account amounted to $9,500. 5. cash collections of receivables were $5,500. 6. on october 1, 2012, the company paid $3,600 in advance for a 12-month insurance policy that became effective on october 1. 7. supplies on hand as of december 31, 2010 amounted to $225. the amount of cash flow from investing activities would be: