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Svetllana [295]
3 years ago
13

B. Sara correctly answered 84% of the questions

Mathematics
2 answers:
hichkok12 [17]3 years ago
8 0
21 questions right
proportion is 21/25
Rudik [331]3 years ago
6 0

Answer:

21

Step-by-step explanation:

84% = 84/100

= 0.84

multiply 25 by 0.84 for result

0.84 x 25 = 21

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The number of calories burned at the gym is normally distributed with a mean of 425 and a standard deviation of 51. Find the Z-s
Galina-37 [17]

Answer:

(a) -3.708

(b) 1.706

(c) 0.490

Step-by-step explanation:

The z-score of normal distribution is given as:

z=\frac{x-\mu}{\sigma}

(a)

Given:

Score is, x=268

Mean value is, \mu =425

Standard deviation is, \sigma = 51

z-score is, z=\frac{268-425}{51}=\frac{-157}{51}=-3.078

(b)

Given:

Score is, x=512

Mean value is, \mu =425

Standard deviation is, \sigma = 51

z-score is, z=\frac{512-425}{51}=\frac{87}{51}=1.706

(c)

Given:

Score is, x=450

Mean value is, \mu =425

Standard deviation is, \sigma = 51

z-score is, z=\frac{450-425}{51}=\frac{25}{51}=0.490

6 0
3 years ago
How to do this question?
Westkost [7]

OK so each block is 3cm tall and 3.5cm wide (because 2 are 7cm wide)

so to measure the perimeter count all the side values for example:

the 5 squares at the bottom which measure 3.5cm each adds up to a total of 17.5cm then if you add the top 2 flat sides that's another 2, 3.5cm which adds up to 7cm. 17.5cm + 7cm = 24.5cm then their are 3 walls on each side measuring 3cm each so 3cm * 6 = 18


24.5cm + 18cm = 42.5cm (I think this is correct)

7 0
3 years ago
Read 2 more answers
A 5 inch × 7 inch photograph is placed inside a picture frame. Both the length and width of the frame are 2x inches larger than
Svetach [21]
The options are;
<span>a)4x+12
b)8x+24
c)2x^4+24
d)4x^2+24x+35
</span>

dimensions of the photograph 
length - 7 inch 
width - 5 inch
dimensions of the photo frame is 2x larger than both width and length 
length - 7 + 2x
width - 5 + 2x
the perimeter is sum of all 4 sides 
Perimeter = 2(7 + 2x) + 2(5 + 2x)
                 = 14 + 4x + 10 +4x
                 = 24 + 8x
correct answer is b
4 0
3 years ago
How many hours is 10:52 am to 4:53 pm?
rosijanka [135]
If you want rough hours, it would be 6. Round the 10:52 to 11, and the 4:53 to 5, its 6 hours. You want specifics though, it would be exactly 6 hours and 1 minute.
8 0
4 years ago
Find the value of tan<br> Х<br> 45°<br> 315<br> Please help me ASAP please
Zanzabum

9514 1404 393

Answer:

  1

Step-by-step explanation:

The right triangle is isosceles, so x = 45° and tan(x) = 1.

__

You can determine tan(x) either from your knowledge of trig function values, or from the fact that the two legs of the triangle are of equal length. The tangent is the ratio of the opposite leg to the adjacent one. When those legs are the same, the ratio is 1.

3 0
3 years ago
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