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Ivan
3 years ago
13

What is an expression equivalent to 7(c-4)

Mathematics
1 answer:
Lemur [1.5K]3 years ago
7 0

Answer:

7c - 28

Step-by-step explanation:

7(c - 4)

(7 × c) + (7 × - 4)

7c + (7 × - 4)

7c + -28

7c - 28

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Drag each object to show whether distance is proportional to time in the situation represented.
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As you kno thankA

Step-by-step explanation:

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What number is equivalent to 3/4 b-2/3 b =-9
Shtirlitz [24]
Hi,

b =  - 9 \\ \frac{3}{4}  \times b -  \frac{2}{3}   \\ 0.75 \times  - 9 - 0.67 \\  - 6.75 - 0.67 =   - 7.42

Answer: -7.42

Hope this helps.
r3t40
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3 years ago
What does -2(-5x+9)-9x equal
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-2(-5x+9)-9x
-2(-5x)+-2(9)-9x
10x-18-9x
+9        +9
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----    ----
19     19
x=-1.05
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3 years ago
Hannah is a photographer who specializes in portraits. This morning, she spent four hours doing graduation portrait sessions. In
stiv31 [10]

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graduation

Step-by-step explanation:

6 0
3 years ago
According to a survey, the average American person watches TV for 3 hours per week. To test if the amount of TV in New York City
Neporo4naja [7]

Answer:

Test statistic (t-value) of this one-mean hypothesis test is -2.422.

Step-by-step explanation:

We are given that according to a survey, the average American person watches TV for 3 hours per week. She surveys 19 New Yorkers randomly and asks them about their amount of TV each week, on average. From the data, the sample mean time is 2.5 hours per week, and the sample standard deviation (s) is 0.9 hours.

We have to test if the amount of TV in New York City is less than the national average.

Let Null Hypothesis, H_0 : \mu \leq 3  {means that the amount of TV in New York City is less than the national average}

Alternate Hypothesis, H_1 : \mu > 3   {means that the amount of TV in New York City is more than the national average}

The test statistics that will be used here is One-sample t-test statistics;

        T.S. = \frac{\bar X - \mu}{\frac{s}{\sqrt{n} } } ~ t_n_-_1

where, \bar X = sample mean time = 2.5 hours per week

             s = sample standard deviation = 0.09 hours

             n = sample size = 19

So, <u>test statistics</u> = \frac{2.5 - 3}{\frac{0.9}{\sqrt{19} } } ~ t_1_8

                              = -2.422

Therefore, the test statistic (t-value) of this one-mean hypothesis test (with σ unknown) is -2.422.

8 0
3 years ago
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