A toy drone has been programmed to fly in a pattern of a cosine wave. You are timing the drone's movements. At 11 seconds on your stopwatch, it is 35 feet in the air, which is the highest it gets. At 21 seconds, it has dropped down to 5 feet, which is the lowest it gets. At 31 seconds, it is back up to 35 feet again. It continues in this pattern for a while and you continue to time its movements. What is the amplitude, vertical shift, phase shift, period, variable b, and how many seconds after the 41 second mark until it reaches 23 feet?? URGENT

/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?

What percent of the circle below is shaded?

Which of the following contains a variable?