22. A house painter uses both paint and primer to complete a job. On Monday, the house painter bought 3 cans of paint that each cost the same amount of money. He also bought 2 cans of
primer that each cost the same amount of money. The total cost of the purchase was $90.
a. Write an equation that can be used to find x, the cost in dollars of each can of paint bought
on Monday, and y, the cost in dollars of each can of primer bought on Monday.

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

What is the value of the expression i 0 × i 1 × i 2 × i 3 × i 4? 1 –1 i –i

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