An airplane is preparing to land at an airport. It is 42,000 feet above the ground and is descending at the rate of 3,400 feet per minute. At the same airport, another airplane is taking off and will ascend at the rate of 2,600 feet per minute. When will the two airplanes be at the same altitude and what will that altitude be?

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answer: d.) the total number of protons and neutrons is 15

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for this case we have that by definition, the volume of a cylinder is given by:

where:

r: it's the radio

h: it's the height

we have as data that:

substituting:

so, the cylinder volume is

option d