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kirill115 [55]
4 years ago
15

Does it matter what interval you use when you find the rate of change of a proportional relationship

Mathematics
1 answer:
LekaFEV [45]4 years ago
7 0
Proportions are the comparison of two equal ratios. Therefore, proportional relationships are relationships between two equal ratios.  So yes, it does matter.. I<span>nterval: all the numbers between two given numbers.</span>
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Yusuf walked 4 miles per hour for 0.7 hours. How far did Yusuf walk?
DIA [1.3K]

Answer:

Yusuf walked 2.8 miles.

Step-by-step explanation:

r = 4 miles / hour

t = 0.7 hours.

d = r*t

d = 4 * 0.7

d = 2.8 miles

4 0
3 years ago
four fifth of terrences text messages are to his friends. one half of those messages are to his friend bianca. Terrence sends 12
miv72 [106K]
60 text messages is your answer

8 0
3 years ago
Read 2 more answers
A market research firm supplies manufacturers with estimates of the retail sales of their products from samples of retail stores
allochka39001 [22]

Answer:

Confidence interval = (4.61972, 25.46428)

Margin of Error = 3.9078675

Step-by-step explanation:

Given that :

This year:

Mean (μ1) = 64

Standard deviation (s1) = 13.8

Sample size (n1) = 28

Last year:

Mean (μ2) = 48.958

Standard deviation (s2) = 15.4

Sample size (n2) = 28

99% confidence interval estimate of the difference μ1−μ2

α = 1 - 99% = 0.01

(μ1−μ2) ± t0.01,27 * (√s1²/n1 + s2²/n2)

t0.01, 27 = 2.770683 (t value calculator)

√s1²/n1 + s2²/n2 = √13.8^2/28 + 15.4^2/28 = 3.9078675

(64 - 48.958) ± 2.667(3.9078675)

15.042 ± 10.42228

(15.042 - 10.42228), (15.042 + 10.42228)

(4.61972, 25.46428)

The margin of error :

√(s1²/n1) + (s2²/n2)

√(13.8^2/28) + (15.4^2/28)

√(6.8014285 + 8.47)

√15.2714285

= 3.9078675

3 0
3 years ago
Simplify the expression 3(a - 7)
Zolol [24]

Answer:

3a - 21

Step-by-step explanation:

3 ( a - 7 )

= 3 ( a ) + 3 ( - 7 )

= 3a - 21

4 0
3 years ago
Read 2 more answers
Let sets A and B be defined as follows.
zhenek [66]

Answer:

n(A) = 3

n(B) = 6

-6 ∈ A => True

-14 ∈ A => False

k ∈ B=> True

Q∈B = >False

Step-by-step explanation:

Given

A is the set of integers greater than - 7 and less than - 3

B={c, h, j, k, v, y}

For set A:

The integers greater than -7 will be -6,-5 ....

As the set has integers less than -3, the set will be:

A = \{-6,-5,-4\}

<u>Cardinalities:</u>

Cardinality is the number of elements in the set.

So,

n(A) = 3\\n(B) = 6

Now for the statements:

-6 ∈ A        True as -6 is a member of set A

-14 ∈ A       False as -14 is not a member of A

k ∈ B          True

Q∈B            False

Hence,

n(A) = 3

n(B) = 6

-6 ∈ A => True

-14 ∈ A => False

k ∈ B=> True

Q∈B = >False

5 0
3 years ago
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