Bloom247
09.07.2019 •
Mathematics
Arino can run at speeds about 28 miles per hour. what is that speed in feet per secsec, to the nearest whole number? (remember there are 5280 feet in a mile, 60 seconds in a minute, and 60 minutes in a hour.)
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Ответ:
Remark
You can use a method called unit analysis to solve this problem. You will use it many times in your education later on.
Solve
Now sort out the numbers in the numerator and those in the denominator and multiply them together.
Numerator 28 * 5280 * 1 * 1 = 147840
Denominator: 60 * 60 = 3600
Now divide the numerator by denominator
Answer = 147840 / 3600 = 41.1 Feet / second
28 miles per hour = 41.1 feet / second
Ответ:
The ladder will go approximately 35.71 ft up the building.
Step-by-step explanation:
The 50 ft ladder is leaning against a building and the base of the ladder is 35 feet from the base of the building.
It means the ladder will form a right triangle with the building with the following dimensions:
base = 35 f t hypotenuse = 50 f t height = ?Using the Pythagorean Theorem to determine the height,
Here,
a is the heightb is the basec is the hypotenuseSubstitute the given values into the equation to determine the height:
We know that height can not be negative. Thus,
ft
Therefore, the ladder will go approximately 35.71 ft up the building.