(this is 12 year old math) the price of a visit to the dentist is calculated according to the formula 50+100n where n is the number of cavities the dentist finds. On your Last visit to the dentist, 2 cavities we're found.
what's the cost of your visit? ​

Which number produces a rationale number when multiplied by 1/5

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.

Acircle has a circumference of 7.850 units. what is its radius?