The sanders family and the wright family each used their sprinklers last summer. the sanders family's sprinkler was used for 20 hours. the wright family's sprinkler was used for 35 hours. there was a combined total output of 1025l of water. what was the water output rate for each sprinkler if the sum of the two rates was 40l per hour?

If a || b and e || f , what if the value of y ?

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

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.