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hoa [83]
4 years ago
13

Who knows how to do this

Mathematics
1 answer:
My name is Ann [436]4 years ago
6 0
I think B? hope that's right!!
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Solve the system of equations. <br><br> {y=x^2+9<br> {y=6x
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<span><span> {y,x} = {7,2}</span>  </span>System of Linear Equations entered :<span><span>  [1] y - 6x = -5 </span><span>  [2] y + x = 9 </span></span>Graphic Representation of the Equations :<span> -6x + y = -5 x + y = 9
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4 years ago
Problem PageQuestion Calcium levels in people are normally distributed with a mean of mg/dL and a standard deviation of mg/dL. I
SIZIF [17.4K]

Complete Question

The complete question is shown on the first uploaded image

Answer:

The  calcium level that is the borderline between low calcium levels and those not considered low is  c = 8.68

Step-by-step explanation:

From the question we are told that

    The mean is  \mu =  9.5\  mg/dL

     The standard deviation \sigma =  0.5 \ mg/dL

    The proportion of the population with low calcium level is  p =5% = 0.05

Let X be a X random calcium level

  Now the  P(X < c) = 0.05

Here P denotes probability

        c is population with calcium level at the borderline

  Since the calcium level is normally distributed the z-value is  evaluated as

    P(Z < \frac{c - \mu}{\sigma } ) = 0.05

The critical value for 0.05 from the standard normal distribution table is

       t_{0.05} = -1.645

=>    \frac{c - \mu}{\sigma }  =  -1.645

substituting values

       \frac{c - 9.5}{0.5 }  =  -1.645

=>    c - 9.5 =  -0.8225

=>     c = 8.68

 

6 0
4 years ago
5squared - 2 (4-3)<br>Need to show work please!
iogann1982 [59]

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6 0
3 years ago
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Which word problem correctly uses the expression 3/4 ÷ 1/8 ?
jonny [76]
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3 0
3 years ago
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An evergreen nursery usually sells a certain shrub after 9 years of growth and shaping. The growth rate during those 9 years is
Volgvan

Answer:

(a) After t years, the height is

18t² + 3t + 10

(b) The shrubs are847 cm tall when they are sold.

Step-by-step explanation:

Given growth rate

dh/dt = 1.8t + 3

dh = (18t + 3)dt

Integrating this, we have

h = 18t² + 3t + C

When t = 0, h = 10cm

Then

10 = C

So

(a) h = 18t² + 3t + 10

(b) Because they are sold after every 9 years, then at t = 9

h = 18(9)² + 3(9) + 10

= 810 + 27 + 10

= 847 cm

3 0
3 years ago
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