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Sunny_sXe [5.5K]
3 years ago
15

Can someone help with 31?!!!

Mathematics
1 answer:
Anton [14]3 years ago
8 0
Standard deviation is the data's average variation from the mean, so if you have a standard deviation of 0, that means all of the student's grades are the same grade.
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Help please................
Zinaida [17]
The answer is yes she incorrectly graphed using the points (-2,4) instead of the point (4,-2). This is the answer because if you solve the equation given you should get y=-3/5x+2/5 so a and e will be wrong and if you plug one of the points in you will give a untrue statement so its not d so you are left with b and c so you plug in the end request and you get a true statement with b equaling -2 if you plug in 4 in for x
5 0
3 years ago
1.which side of AFED does AB in AABC correspond to?
erma4kov [3.2K]

Rotate one of them so the right angle is in the same orientation as the other one.

1. AB = DE

2. CB = FE

3. AC = DF

4. Compare the length of two known sides: cb and EF

CB = 3 and EF = 8

8/3 = 2 2/3 scale factor

5. Ab is side de. Multiply the length of ab by the scale factor:

4 x 2 2/3 = 10 2/3

6. FD = sqrt ( 10 2/3^2 + 8^2)

FD = 13 1/3

6 0
3 years ago
HELP ASAP. solve for x
svp [43]

Answer:

x = 80

Step-by-step explanation:

x + 30 = 110 (Opposite angles are equal)

x = 110 - 30

x = 80

4 0
3 years ago
The hypotenuse of a right triangle is 50 and the short leg is 30, find the projection of the leg onto the hypotenuse
gladu [14]
Consider the attached figure. All the triangles shown are similar, so

CB/CA = CD/CB
30/50 = projection/30
projection = 30^2/50
projection = 18

6 0
3 years ago
Solve sin^2x+cos2x-1/4=0
sweet-ann [11.9K]
sin^{2}x + cos2x - \frac{1}{4} = 0
sin^{2}x + cos^{2}x - sin^{2}x = \frac{1}{4}
cos^{2}x = \frac{1}{4}
cos(x) = \pm \frac{1}{2}

x = \pm \frac{\pi}{3}
General solutions: x = \pi(n - \frac{1}{3}) and x = \pi(n + \frac{1}{3})
8 0
3 years ago
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