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anzhelika [568]
3 years ago
12

After swimming 80 feet below the surface of the water, a whale swims up 40 feet. Use a number line to help you create an equatio

n that shows the new location of the whale in relation to the water's surface.
A) The equation is -80 + (-40) = -120. The whale is 120 ft below the water's surface.
B) The equation is -80 + 40 = -40. The whale is 40 ft below the water's surface.
C) The equation is -80 + (-40) = -40. The whale is 40 ft below the water's surface.
D) The equation is -80 + 40 = -120. The whale is 120 ft below the water's surface.​
Mathematics
1 answer:
juin [17]3 years ago
5 0
Answer: D
hopenitvhelz
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Answer:

  see below

Step-by-step explanation:

Put -1 where x is in each expression and evaluate it.

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Substituting x=-1 into this factor makes it be ...

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Evaluating the first expression, we have ...

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This first expression is one you want to "check."

You can see that the reason the expression is zero is that x+1 has a sum of zero. You can look for that same sum in the other expressions. (The tricky one is the one with the factor (x -(-1)). You know, of course, that -(-1) = +1.)

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3 years ago
Writing a Linear Equation Given Two Points
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The equation of a line with slope m passing through a point P(a, b) is given by
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We can consider any of the points (-1, 7), or (2, 10). Let's choose (2, 10):

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  Answer: </span><span>C. −x+y=8</span>
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