Mr. nelson used 3/8 of his money to buy some pens and 2/5 of the remainder to buy 2 notebooks. a notebook costs 3 times as much as a pen. how many pens did he buy?

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Aroulette wheel has 38 slots in which the ball can land. two of the slots are green, 18 are red, and 18 are black. the ball is equally likely to land in any slot. the roulette wheel is going to be spun twice, and the outcomes of the two spins are independent.the probability that it lands one time on red and another time on black in any order is(a) 0.5 (b) 0.25 (c) 0.4488 (d) 0.2244

Which strategy is used by public health to reduce the incidence of food poisoning?