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polet [3.4K]
2 years ago
15

PLS HELP ASAP :) Explain pls also!

Mathematics
1 answer:
Andru [333]2 years ago
6 0
11 students received a score of 80 or better because the chart says that 7 students received a score of 80-89 and 4 students received a score of 90-100
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16) (1 Point) : Solve the equation
Marat540 [252]

Answer:

(B)

4 +/- 3 sqrt(2) or 4+3sqrt(2) and 4-3sqrt(2)

Step-by-step explanation:

4(c-4)^2=72

4(c-4)(c-4)=72

foil the parenthesis (first, outside, inside, last)

4(c^2 -4c -4c +16)=72

4(c^2-8c+16)=72

divide each side by 4

c^2-8c+16=18

subtract 18 from both sides

c^2-8c-2

use quadratic formula

((-b +/- sqrt((-b^2)-4ac)))/2a

((-(-8)+/-sqrt((-8)^2-4(1)(-2)))/2(1))

(8+/-sqrt(64-(-8)))/2

(8+/-sqrt(64+8))/2

(8+/-sqrt(72))/2

(8+/-sqrt(36 * 2))/2

(8+/-6sqrt(2))/2

4+/-3sqrt(2)

or 4+3sqrt(2) and 4-3sqrt(2)

3 0
2 years ago
Xavier ran four miles on his first day of training. The next day he ran eight ninths that distance. How far did he run on the se
serg [7]
Well, it's the product of 8/9 and the 4 miles. The result is 32/9 miles, that is, 3,55 miles.
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3 years ago
What is the slope? I'll marl the first correct answer brainliest. Please.
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the slope is 0, 2, 4, 6, 8 , and 10

Step-by-step explanation:

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2 years ago
Which of the following statements is true of a reflection?
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I think the correct answers from the choices listed above are the first and the fourth option. The statements that are true about a reflection would be that it  is an isometry and the it flips a plane about a fixed line. <span>A </span>reflection<span> over a line k (notation rk) is a transformation in which each point of the original figure (pre-image) has an image that is the same distance from line k.</span>
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Write two mixed numbers that are equal to 7.5
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Seven and one half or seven and eight sixteenths
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3 years ago
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