For your next print mail campaign, you learn that the cost to print 5,000 postcards is $4,800 and cost to print 15,000 is $5,500. what is the marginal (extra) cost per postcard for the additional 10,000?

Somone me i want to know what 18 hours out of 24 hours in a fraction

Martha has a deck of cards. she has lost some of the cards, and now the deck only contains nine spades, eleven diamonds, eight clubs, and twelve hearts. martha predicts that whenever she draws a card from the deck without looking, she will draw a club one-fifth of the time. which activity would best allow martha to test her prediction? a. randomly draw a card from the box and see if it is a club. b. randomly draw a card. then, continue to draw another card until all eight clubs are drawn. c. randomly draw and replace a card 120 times. then, observe how close to 30 times a club is drawn. d. randomly draw and replace a card 100 times. then, observe how close to 20 times a club is drawn.

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.