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2 years ago

Change 4 and 4 on 9 to an improper fraction

2 answers:

8 0

4 4/9 you multiply the denominator, 9, by the whole number, 4. (36) Then you add the numerator, 4 to get 40. That’s how many 9ths you have. 40/9.

Because each one of the whole number = 9/9ths

So when we multiply as above, you are adding 9/9 + 9/9 + 9/9 + 9/9 + 4/9. Add the numerators, but the denominator stays the same.

Taya2010 [7]2 years ago

4 0

Answer: 40/9

Step-by-step explanation:

First multiply the number 4 and the denominator 9 together which is 36 in this case. Then add the remaining 4 which takes you to 40 then the denominator will stay the same so the answer will be 40/9

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Most dermatologists recommend using sunscreens that have a Sun Protection Factor (SPF) of at least 30. One of the authors wanted

Basile [38]

Answer: We are 95% confident that the mean SPF level of sunscreen used by all Cal Poly students is between 29.0813 and 40.0187.

Step-by-step explanation:

Given : Significance level : $\alpha: 1-0.95=0.05$

Sample size : n= 52 , which is a large sample (n>30), so we use z-test.

By using z-value table,

Critical value: $z_{\alpha/2}=1.96$

Sample mean : $\overline{x}= 34.55$

Standard deviation : $\sigma= 20.12$

The confidence interval for population means is given by :-

$\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}$

i.e. $34.55\pm(1.96)\dfrac{ 20.12}{\sqrt{52}}$

$=34.55\pm5.46867829455\\\\\approx34.55\pm5.4687\\\\=(34.55-5.4687, 34.55+5.4687)=(29.0813,\ 40.0187)$

Now, the 95% confidence interval for the ppopulation mean = . (29.0813, 40.0187)

Hence, We are 95% confident that the mean SPF level of sunscreen used by all Cal Poly students is between 29.0813 and 40.0187.

7 0

2 years ago

Can you help me with this question?

Masteriza [31]

Answer:

Step-by-step explanation:

1. A + B

2. 9 + u - 10

3. m - 2 / 2

3 0

2 years ago

Gregory knows that Triangle A B C is reflected onto Triangle A prime B prime C prime. Which statement about the figures is true?

ziro4ka [17]

Answer: if Gregory draws the segment with endpoints A and A’, then the midpoint will lie on the line of reflection.

Explanation:

Given that a triangle ABC is reflected in triangle A'B'C'

Here reflection is done on a line

If you imagine the line as a mirror then ABC will have image on the mirror line as A'B'C'

Recall that in a mirror the object and image would be equidistant from the mirror and also the line joining the image and object would be perpendicular to the mirror

But note that corresponding images will only be perpendicular bisector to the line

So A and A' only will be corresponding so AA' will have mid point on line

Option 1 is right

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2 years ago

What is 2+2?!?!?!?!?!

Valentin [98]

Answer:

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

Find A n B if A={3,6,9,12} and B={2,4,6,8,10,12}

SashulF [63]

A ∩ B = {3, 6, 9, 12} ∩ {2, 4, 6, 8, 10, 12}
= {6, 12}