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il63 [147K]
2 years ago
15

If the sum of a number and three is doubled?, the result is seven less than the number. Find the number

Mathematics
1 answer:
pentagon [3]2 years ago
6 0
(x+3)*2=x-7
2x+6=x-7
x=-13
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Find the exact value of the trigonometric function given that sinU=-7/25 and cosV=-4/5 (Both U and V are in Quadrant III)
Contact [7]

cosU:-

\\ \rm\longmapsto \sqrt{1-sin^2U}=\sqrt{1-49/625}=24/25

As U lies in Q3

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sinV

\\ \rm\longmapsto \sqrt{1-cos^2V}=\sqrt{1-16/25}=3/4

As V lies in Q3

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So

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3 0
2 years ago
Mr. Fink's economy car can travel 420 miles on a 12-gallon tank of gas. Determine how many miles he can travel on 8 gallons.
Sphinxa [80]

Answer:

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So, 420 miles=12 gallons

That means that for 1 gallon you would be able to go 35 miles.

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3 0
3 years ago
Use the following stem-and-leaf plot to answer the question.<br><br><br>What is the median?
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The median of the stem-and-leaf plot is 23

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3 years ago
Lisa says that 43 is an odd number that is composite . Is she correct? Explain.
Assoli18 [71]

Lisa is incorrect although it is an odd number it is not composite. It only has itself and 1. Therefore its a prime number.

This is the definition for prime if you still dont understand.

A prime number is a whole number greater than 1 whose only factors are 1 and itself.

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The <u><em>correct answer</em></u> is:

d) People per hour, because the dependent quantity is the people

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In this situation, the two quantities are people and hours. These are the two things in this problem we can count or measure.

The independent variable is the one that causes a change, while the dependent variable is the one that <em>gets</em> changed. In this situation, the number of people change every hour; this means the number of people <em>gets</em> changed, which makes it the dependent variable. This means that the independent variable must be time.

Since people is dependent and time is independent, "people per hour" would be the best form of this statement.

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