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3 years ago

Please help!!!!!!!!!!!!!!!!!!!!!

Mathematics

1 answer:

Dovator [93]3 years ago

4 0

Collect like terms:
You have 2 with mn so 9mn - 9mn =0
You also have 2 with m4n so -19m4n - 12m4n = -31m4n
Put it together:
-31m4n -8m2
So C
Let me know if you have any questions

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A 5,400 W motor is used to work. If the motor is used for 640s, about how much work could it do?

maks197457 [2]

It is option c 3,500,000

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3 years ago

Please help me I am its in the pic

tiny-mole [99]

Answers:

1. gh = -21

2. g^2 - h = 46

3. g + h^2 = 2

4. g + h = -4

5. h - g = 10

6. g - h = -10

Step-by-step explanation:

1. -7 x 3 = -21

2. -7^2 = - 49

-49 + 3 = -46

3. 3^2 = 9

-7 + 9 = 2

4. -7 + 3 = -4

5. 3 - -7 = 3 + 7 = 10

6. -7 - 3 = -10

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3 years ago

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sveta [45]

Answer:

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Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

The daily revenues of a cafe near the university are approximately normally distributed. The owner recently collected a random s

lbvjy [14]

Answer:

The sample size to obtain the desired margin of error is 160.

Step-by-step explanation:

The Margin of Error is given as

$MOE=z_{crit}\times\dfrac{\sigma}{\sqrt{n}}$

Rearranging this equation in terms of n gives

$n=\left[z_{crit}\times \dfrac{\sigma}{M}\right]^2$

Now the Margin of Error is reduced by 2 so the new M_2 is given as M/2 so the value of n_2 is calculated as

$n_2=\left[z_{crit}\times \dfrac{\sigma}{M_2}\right]^2\\n_2=\left[z_{crit}\times \dfrac{\sigma}{M/2}\right]^2\\n_2=\left[z_{crit}\times \dfrac{2\sigma}{M}\right]^2\\n_2=2^2\left[z_{crit}\times \dfrac{\sigma}{M}\right]^2\\n_2=4\left[z_{crit}\times \dfrac{\sigma}{M}\right]^2\\n_2=4n$

As n is given as 40 so the new sample size is given as

$n_2=4n\\n_2=4*40\\n_2=160$

So the sample size to obtain the desired margin of error is 160.

4 0

4 years ago

How to solve 3&2/3+8+1&1/3

patriot [66]

$3 \frac{2}{3} + 8 + 1 \frac{1}{3}$
First, add the fractions because they already have a common denominator.

$(3 \frac{2}{3} + 1 \frac{1}{3} ) + 8$
3 plus 1 equals 4. The fractions make 3/3 which equals 1. 4 plus 1 equals 5.
$5 + 8$
Your answer is 13.

Hope this helps!

:)

3 0

3 years ago