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o-na [289]
3 years ago
5

The mean temperature for the first 7 days in January was 4 °C. The temperature on the 8th day was 3 °C. What is the mean tempera

ture for the first 8 days in January?
Mathematics
2 answers:
Agata [3.3K]3 years ago
7 0

Answer:

3.875

Step-by-step explanation:

Bad White [126]3 years ago
3 0

Answer:

Mean temperature for the first 8 days was  3.88^\circ

Step-by-step explanation:

Mean = \frac{4\cdot 7+3\cdot 1}{8}

=3.88^\circ

Best Regards!

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Find the equation of the line that passes through the points (-5,7) and (2,3)
Olegator [25]

Answer:

y=-\frac{4}{7}x+4\frac{1}{7}

Step-by-step explanation:

So, in order to solve this problem, I started off by drawing it out. On my graph that I have attached below, I first started out by locating the points (-5,7) and (2,3). Now, this is an optional step, but I highly encourage practicing your graphing skills by solving this problem on graph paper as well. Next, I connected the two points that I just graphed. This is the line that passes through (-5,7) and (2,3).

Now, here is where the actual solving starts. If you haven't already been taught this yet, I will introduce it to you now. I am going to find the equation of this line by filling in what I know in the equation y=mx+b, where m= the slope of the line, and b= y intercept.

Slope of the line: m= \frac{y_{1} - y_{2}  }{x_{1} - x_{2}  } = \frac{7-3}{-5-2} = \frac{4}{-7}= -\frac{4}{7}

If you haven't been taught how to find the slope of a line I recommend you find out.

Substitute the slope into the equation.

y=-\frac{4}{7} x+b\\

Now, we will solve for the 'b,' or y intercept.

We already have x and y values to use: (-5,7) or (2,3). I'll use x=2 and y=3 to solve for the y intercept.

y=-\frac{4}{7} x+b\\\\3=-\frac{4}{7} *2+b\\\\3=-\frac{8}{7} +b\\b=3+\frac{8}{7} \\b=\frac{21}{7}+\frac{8}{7}=\frac{29}{7} =4\frac{1}{7} \\b=4\frac{1}{7}

Last step: substitute the slope and y intercept into y=mx+b.

y=mx+b\\y=-\frac{4}{7}x+4\frac{1}{7}

That is the answer to this problem.

I hope this helps.

3 0
3 years ago
Is 3/47 a rational number
lesya692 [45]
3/47 is a rational number

p/q is a rational number, where p and q are real integers, and q does not equal to 0.
8 0
3 years ago
Help me with this :))))))
ollegr [7]

Answer:

CE = 21.2

Step-by-step explanation:

CE = CD + DE = 14 + 7.2 = 21.2

7 0
3 years ago
Are the two triangles below similar??
kodGreya [7K]

Answer:

Yes

Step-by-step explanation:

If you find the value of all the angles, you'll find that both triangles' angles are 50, 35, and 90 degrees.

(all the angles in a triangle add up to 180)

7 0
2 years ago
Write the set of points from −8 to −2 but excluding −3 and −2 as a union of intervals
Sauron [17]
If you're only dealing with integers, then the answer is:

[-8 , -3)

If you're dealing with real numbers, then the answer is:

[-8, -3)∪(-3, -2)
3 0
3 years ago
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