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3 years ago

Help on 4.) and 5.)!!!! 49 POINTS!!! A

Mathematics

2 answers:

attashe74 [19]3 years ago

7 0

Answer:

4=3/1

5=3 more pieces

Step-by-step explanation:

Andrews [41]3 years ago

5 0

4. The reciprocal means flip so a becomes 1/a

1/3 becomes 1 /(1/3) = 3

5. 6 divided by 1/2

copy dot flip

6 * 2/1 = 12

she has 12 pieces of string

she needs 15

15 -12 =3

She needs to cut 3 more pieces of string

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Find x if f(x) = 2x + 7 and f(x) = -1.<br> A.5<br> B.-4<br> C.-4

faltersainse [42]

Answer:

x = - 4

Step-by-step explanation:

Hi there !

if f(x) = 2x + 7 and f(x) = -1 =>

2x + 7 = - 1

2x = - 1 - 7

2x = - 8

x = - 8 ÷ 2

x = - 4

Good luck !

5 0

2 years ago

Edwin got 95% of the questions right on a quiz. If there were 20 questions on the quiz, how many questions did he miss??

Fed [463]

Answer:

1 question

Step-by-step explanation:

If Edwin got a 95% of the questions right on a 20 question quiz, .95(20) is 19, meaning that he got 19 questions right. 20-19 is 1, which means he got 1 question wrong.

7 0

2 years ago

Read 2 more answers

A population has a standard deviation of 5.5. What is the standard error of the sampling distribution if the sample size is 81?

VladimirAG [237]

Answer:

$\sigma = 5.5$

And we have a sample size of n =81. We want to estimate the standard error of the sampling distribution $\bar X$ and for this case we know that the distribution is given by:

$\bar X \sim N(\mu ,\frac{\sigma}{\sqrt{n}})$

And the standard error would be:

$\sigma_{\bar x}= \frac{\sigma}{\sqrt{n}}$

And replacing we got:

$\sigma_{\bar x}=\frac{5.5}{\sqrt{81}}= 0.611$

Step-by-step explanation:

For this case we know the population deviation given by:

$\sigma = 5.5$

And we have a sample size of n =81. We want to estimate the standard error of the sampling distribution $\bar X$ and for this case we know that the distribution is given by:

$\bar X \sim N(\mu ,\frac{\sigma}{\sqrt{n}})$

And the standard error would be:

$\sigma_{\bar x}= \frac{\sigma}{\sqrt{n}}$

And replacing we got:

$\sigma_{\bar x}=\frac{5.5}{\sqrt{81}}= 0.611$

4 0

3 years ago

What value of r is the solution of the equation 3/4r = 7/3

Liula [17]

R= 28/9. Hope this helps

4 0

3 years ago

Kayla won 37 super bouncy balls

Mariana [72]

Answer:

15 friends

Step-by-step explanation:

37 - 7=30 so then you divide 30 by 2 which equals 15 so there is your answer.

7 0

3 years ago