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Jlenok [28]
3 years ago
10

EAST MATH PLS HELP ASAP PLEASE PLEASE

Mathematics
1 answer:
serious [3.7K]3 years ago
7 0
4(x+7)=8x-20

4x+28=8x-20

28=4x-20

48=4x

x=12
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Assume that blood pressure readings are normally distributed with a mean of 124 and a standard deviation of 6.4. If 64 people ar
Murrr4er [49]

Answer:

99.38%

Step-by-step explanation:

We have that the mean (m) is equal to 124, the standard deviation (sd) 6.4 and the sample size (n) = 64

They ask us for P (x <126)

For this, the first thing is to calculate z, which is given by the following equation:

z = (x - m) / (sd / (n ^ 1/2))

We have all these values, replacing we have:

z = (126 - 124) / (6.4 / (64 ^ 1/2))

z = 2.5

With the normal distribution table (attached), we have that at that value, the probability is:

P (z <2.5) = 0.9938

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4 0
3 years ago
Assuming we have an upward-facing parabola describe the location of the vertex in relation to the x-axis (above, below, or on th
goldfiish [28.3K]

Answer:

a. Negative discriminant: above  

b. Positive discriminant:  below

c. Discriminant is zero: on

Step-by-step explanation:

If the discriminant is negative, then there are no real zeros. We have an upward-facing parabola, then the vertex is located above the x-axis

If the discriminant is positive, then there are two different real zeros. We have an upward-facing parabola, then the vertex is located below the x-axis

If the discriminant is zero, then there is one zero. We have an upward-facing parabola, then the vertex is located on the x-axis

4 0
3 years ago
A rectangular skateboard park has an area of x^2+15x+56 what are the possible dimensions
alexira [117]
For this case we have the following expression:
 x ^ 2 + 15x + 56
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 Factoring we have:
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 Answer:
 
the possible dimensions are:
 
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7 0
3 years ago
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tester [92]
 <span>Just graph the function up to and/or including the points indicated. 

- if you have a piecewise function defined as y=x when x < 0 
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You would graph y=x from the negative direction up to 0 (but leaving an open circle on 0 because the function is not defined there 

Then start at point 1 (this time with a closed circle because y=-x is defined at 1, and graph y=-x.</span>
4 0
3 years ago
What is -38/-5 as a decimal?
sesenic [268]
Divide -38 by -5
The negatives cancel out since a negative divided by a negative is a positive.
7.6
5 0
3 years ago
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