Consider the experiment of flipping a coin 4 times where the probability of flipping a heads is 0.18. So each outcome of the experiment would be a string of heads and tails of length 4. Assuming each flip is independent, what is the probability that there is a single heads out of the 4 flips? Solution is given as .397 - how is this solution obtained?

/is used for a fraction 1) if x = 2/3 and y = 3/4, what is the value of (x + y) (x/y) expressed as a common fraction? 2) what is the least positive integer greater than 1 that leaves a remainder of 1 when divided by each of 2, 3, 4, 5, 6, 7, 8, and 9? 3) the ponde family's powerjet pumps 420 gallons of water per hour. at this rate, how many gallons of water will it pump in 45 minutes? 4) kim's insurance company pays 80% of the cost of all prescription medication she purchases in a year beyond the first $250 worth of prescriptions. her prescriptions for this year cost a total of $570. how many dollars of this amounts will kim's insurance company pay?

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In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?