Curing times in days (x) and compressive strengths in mpa (y) were recorded for several concrete specimens. the means and standard deviations of the x and y values were x⎯⎯ = 5, sx = 2, y⎯⎯ = 1350, sy = 100. the correlation between curing time and compressive strength was computed to be r = 0.7. find the equation of the least-squares line to predict compressive strength from curing time. round the answers to two decimal places.

Match each expression with its simplified form.

Apatient is to be given 35 milligrams of demerol every 4 hours. you have demerol 50 milligrams/milliliter in stock. how many milliliters should be given per dose?

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.