The maximum heart rate, in beats per minute, that you should achieve during exercise is 220 minus your age, 220 minus a. your exercise goal is to improve cardiovascular conditioning. use the following formulas to answer parts a and b. lower limit of range hequalsseven tenths left parenthesis 220 minus a right parenthesis upper limit of range hequalsfour fifths (220 minus a) a. what is the lower limit of the heart range, in beats per minute, for a 43-year-old with this exercise goal?

Which of the following answers is 7/9 simplified? 7/9 2/9 11/9 2/7

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

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.