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4 years ago

I needed helppp......

Mathematics

2 answers:

Zina [86]4 years ago

4 0

<h3>There are 3 Answers: </h3>

Choice B (-0.5, 0.86)
Choice E (2.22, 3.84)
Choice G (0.78, 1.35)

=========================================================

Explanation:

Check out the attached image below. I'm using the online calculator Desmos. I typed in each function, then clicked the intersection points to have the coordinates show up. You may have to click the points twice if one click doesn't work. You can also use GeoGebra to get the same job done through the Intersect tool. Any graphing calculator will work as well. Keep in mind that because these solutions are approximate, there is a bit of rounding error going on. Also, note that your answer choices are each to two decimal places while desmos sometimes shows three decimal places, so you'll need to round.

NARA [144]4 years ago

3 0

The answer to your question is A , G and F

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The weight of apples is normally distributed. Large apples have a mean of 15 oz and medium apples have a mean of 10 oz. The stan

Leno4ka [110]

Answer:

a) X has a mean of 25 and a variance of 8.

b) The probability that the total weight X is between 22 and 28 oz is 0.711.

Step-by-step explanation:

We have to calculate the mean and variance of a sum of random normal variables.

We can apply the rule for mean and variance for sum of independent variables:

$X=L+M\\\\E(X)=E(L+M)=E(L)+E(M)\\\\V(X)=V(L+M)=V(L)+V(M)-2CoV(L,M)=V(L)+V(M)$

Then, the mean and variance of X is:

$E(X)=E(L)+E(M)=15+10=25\\\\\\V(X)=V(L)+V(M)=2^2+2^2=4+4=8\\\\\sigma_x=\sqrt{V(X)}=\sqrt{8}\approx2.83$

We can calculate the probability that X is between 22 and 28 as:

$z_1=\dfrac{X_1-\mu}{\sigma}=\dfrac{22-25}{2.83}=\dfrac{-3}{2.83}=-1.06\\\\\\z_2=\dfrac{X_2-\mu}{\sigma}=\dfrac{28-25}{2.83}=\dfrac{3}{2.83}=1.06\\\\\\P(22$

4 0

3 years ago

PLEASE HELP ASAP!!!!

lina2011 [118]

<h3>Answer:</h3>

System

p + m = 10
0.8m = 0.4·10

Solution

p = m = 5 — 5 lb peanuts and 5 lb mixture

<h3>Step-by-step explanation:</h3>

(a) Generally, the equations of interest are one that models the total amount of mixture, and one that models the amount of one of the constituents (or the ratio of constituents). Here, there are two constituents and we are given the desired ratio, so three different equations are possible describing the constituents of the mix.

For the total amount of mix:

... p + m = 10

For the quantity of peanuts in the mix:

... p + 0.2m = 0.6·10

For the quantity of almonds in the mix:

... 0.8m = 0.4·10

For the ratio of peanuts to almonds:

... (p +0.2m)/(0.8m) = 0.60/0.40

Any two (2) of these four (4) equations will serve as a system of equations that can be used to solve for the desired quantities. I like the third one because it is a "one-step" equation.

So, your system of equations could be ...

p + m = 10
0.8m = 0.4·10

___

(b) Dividing the second equation by 0.8 gives

... m = 5

Using the first equation to find p, we have ...

... p + 5 = 10

... p = 5

5 lb of peanuts and 5 lb of mixture are required.

8 0

4 years ago

If f(x) = 2x + 5x and g(x) = 3x — 5, find (f+ g)(x).

jonny [76]

Answer:

2^x + 8x - 5

Step-by-step explanation:

<h3>Given</h3>

f(x) = 2^x + 5x and g(x) = 3x - 5

(f+ g)(x)

<h3>Solution</h3>

(f+ g)(x) =
f(x) + g(x) =
2^x + 5x + 3x - 5 =
2^x + 8x - 5

4 0

3 years ago

Read 2 more answers

What does the expression 5(x+3) mean?

IRISSAK [1]

Number 1 would be the correct answer :)

7 0

3 years ago

Solve:<br> 2m - 8 = -m + 10

Varvara68 [4.7K]

Step-by-step explanation:

2m+m=10+8

3m=18 /3

M=6

6 0

3 years ago

Read 2 more answers