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harkovskaia [24]
3 years ago
8

Explain how you can use estimation to check that your answer is reasonable

Mathematics
1 answer:
serg [7]3 years ago
7 0
Make sure the estimates are accurate to check that try using the rounding song (if it's 4 or below leave it alone,if it's 5 or higher give it a shove)
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Ed takes five 100-point tests in his algebra class. He scores 87, 85 and 87 points on the first three tests. If the scores of hi
trasher [3.6K]

Answer:

Step-by-step explanation:

When we take an average of something, we have to add up all the data on the somethings and then divide by the number of somethings we have. Ed takes 5 tests, and we have scores for them; we also have his current average. What we don't know for sure are 2 of the 5 test scores, but we have enough to determine what they are.

If one test has a score of x, and the other test is 3 points less than that, the score on that last test is x - 3. Putting all of that together into an average problem:

\frac{87+85+87+x+(x-3)}{5}=90 and simplfiying a bit:

\frac{256+2x}{5}=90. Multiply both sides by 5 to get

256 + 2x = 450; subtract 256 from both sides to get

2x = 194 and divide by 2:

x = 97

The one test score was a 97 and the other one, which was 3 less than that, was a 94.

3 0
3 years ago
Slope is –2 &amp; (5, 3) is on the line.<br> Y-Intercept:<br> Equation of the line (no spaces):
GREYUIT [131]

Answer:

The y intercept is (0,13)

The equation of the line is y = -2x+13

Step-by-step explanation:

The slope intercept form of a line is

y = mx+b  where m is the slope and b is the y intercept

y = -2x+b

Substituting the point

3 = -2(5) +b

3 = -10 +b

Add 10 to each side

13 =b

The y intercept is (0,13)

The equation of the line is y = -2x+13

5 0
3 years ago
Please answer 7/10k=21 find x ill give you brainliest
algol [13]

Answer:

k=2.1

Step-by-step explanation:

7/10k=21

x7         x7 Multiply seven from each side of the equation.

10k=21

/10    /10 Divide ten from each side of the equation. 21/10=2.1

k=2.1

3 0
3 years ago
Sue graphed the formula for converting temperatures from Fahrenheit to Celsius. A graph titled Temperature Conversion has Degree
elena-14-01-66 [18.8K]

Answer:

10 degrees Celsius

Step-by-step explanation:

Since the line goes through point (50, 10) and x represents Fahrenheit, y represents Celsius, then 50 F= 10 C

4 0
3 years ago
Read 2 more answers
A square has a perimeter of 44. What is the length of side?
natka813 [3]
There are 4 sides on a square, and all 4 sides have the same length.
If the perimeter is 44, you would do 44/4.
44= permiter
4= number of sides
7 0
3 years ago
Read 2 more answers
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