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AURORKA [14]
3 years ago
8

PLEASE HELP For BRAINLIEST ANSWER

Mathematics
2 answers:
Anna35 [415]3 years ago
8 0
You do this
8        2
---- = -----
20       5

So the scale factor is 2/5
Pachacha [2.7K]3 years ago
7 0
8        2
---- = -----
20       5

So the scale factor is 2/5
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How is the series 9 + 13+ 17+ ... + 149 represented in summation notation?
VLD [36.1K]

Notice that

13 - 9 = 4

17 - 13 = 4

so it's likely that each pair of consecutive terms in the sum differ by 4. This means the last term, 149, is equal to 9 plus some multiple of 4 :

149 = 9 + 4k

140 = 4k

k = 140/4

k = 35

This tells you there are 35 + 1 = 36 terms in the sum (since the first term is 9 plus 0 times 4, and the last term is 9 plus 35 times 4). Among the given options, only the first choice contains the same amount of terms.

Put another way, we have

\displaystyle 9 + 13 + 17 + \cdots + 149 = \sum_{k=0}^{35} (9 + 4k)

but if we make the sum start at k = 1, we need to replace every instance of k with k - 1, and accordingly adjust the upper limit in the sum.

\displaystyle 9 + 13 + 17 + \cdots + 149 = \sum_{k-1=0}^{35+1} (9 + 4(k-1))

\displaystyle 9 + 13 + 17 + \cdots + 149 = \sum_{k=1}^{36} (5 + 4k)

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2 years ago
How many cups are in a gallon°ω°
Evgen [1.6K]

Answer:

16 cups

Step-by-step explanation:

7 0
3 years ago
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2y-4x=10 solve for x
Rzqust [24]

Answer:

down below :)

Step-by-step explanation:

the answer is x = - y/2 + 5/2

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2 years ago
What is half of 18 !!!
skelet666 [1.2K]

Answer:

9

Step-by-step explanation:

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3 years ago
Sue and Javier are working on a statistics project to estimate the proportion of students at their school who have a pet dog. Su
egoroff_w [7]

Answer:

the width of sue's interval will be narrower than javier's.

Step-by-step explanation:

in this problem, i do believe that sue's interval will be more narrow. in the formula,

p-hat ± \sqrt{phat(1-phat)/ n ,

a larger "n" value will lead to a smaller standard error. given that the population proportion is the same for both, and the sample size is the only difference, the standard error of sue's interval will be smaller than javier's, therefore making her whole confidence interval smaller.

again, i do believe this is correct, this is what i have in my AP stat notes. hope this helps!

6 0
3 years ago
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