Abiologist tracks the number of bacteria. when the water has no chemicals, the number of bacteria (b) is 1200 per gallon. for each tablespoons of the chemical solution (c) added to each gallon of water, the number of bacteria decreases by 75 per gallon. how much of the chemical, in the tablespoons must be added to a 500 gallon tank to reduce the bacteria count to a safe 300 bacteria per gallon?

What is the distance between the points 4,10 and -3,-14 on the coordinate plane

In a test for esp (extrasensory perception), the experimenter looks at cards that are hidden from the subject. each card contains either a star, a circle, a wave, a cross or a square.(five shapes) as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. when the esp study described above discovers a subject whose performance appears to be better than guessing, the study continues at greater length. the experimenter looks at many cards bearing one of five shapes (star, square, circle, wave, and cross) in an order determined by random numbers. the subject cannot see the experimenter as he looks at each card in turn, in order to avoid any possible nonverbal clues. the answers of a subject who does not have esp should be independent observations, each with probability 1/5 of success. we record 1000 attempts. which of the following assumptions must be met in order to solve this problem? it's reasonable to assume normality 0.8(1000), 0.2(1000)%30 approximately normal 0.8(1000), 0.2(1000)% 10 approximately normal srs it is reasonable to assume the total number of cards is over 10,000 it is reasonable to assume the total number of cards is over 1000

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.