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3 years ago

12

Solve. Show all your work. a) -3x+2 = 5 b) }(4x – 4) = 7 Help help help please

2 answers:

Doss [256]3 years ago

6 0

A) x = -1
b) x = 11 / 4

a explanation)
-3 x + 2 = 5
-3 x + 2 - 2 = 5 - 2
-3 x = 5 - 2
-3 x = 3
-3 x / -3 = 3 / -3
x = 3 / -3
x = -1

b explanation)
4 x - 4 = 7
4 x - 4 + 4 = 7 + 4
4 x = 7 + 4
4 x = 11
4 x / 4 = 11 / 4
x = 11 / 4

Reptile [31]3 years ago

3 0

Answer:

A) x=-1

B) x=11/4

Step-by-step explanation:

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vodomira [7]

76 granola bars
to solve this, you need to multiply 15 by 5 for the big boxes and 8 by 2 for the small boxes. 15 x 2 = 60 and 8 x 2 = 16, therefore adding them together gets you 76.

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3 years ago

A study was conducted to compare the proportion of drivers in Boston and New York who wore seat belts while driving. Data were c

allochka39001 [22]

Answer:

a) The test statistic is $z = -2.51$

b) The pvalue is 0.0060.

Step-by-step explanation:

Question a:

Ha: pB < pNY

This means that the alternate hypothesis is rewritten as:

$H_a: p_{B} - p_{NY} < 0$

While the null hypothesis is:

$H_0: p_{B} - p_{NY} = 0$

The test statistic is:

$z = \frac{X - \mu}{s}$

In which X is the sample mean, $\mu$ is the value tested at the null hypothesis and s is the standard error

pB = 0.581, pNY = 0.832

This means that $X = 0.581 - 0.832 = -0.251$

0 is tested at the null hypothesis:

This means that $\mu = 0$

Standard error = 0.1

This means that $s = 0.1$

Test statistic:

$z = \frac{X - \mu}{s}$

$z = \frac{-0.251 - 0}{0.1}$

$z = -2.51$

The test statistic is $z = -2.51$

Question b:

The pvalue is the probability of finding a proportion less than -0.251, that is, a difference of at least 0.251, which is the pvalue of Z = -2.51.

Looking at the z-table, Z = -2.51 has a pvalue of 0.0060

The pvalue is 0.0060.

5 0

3 years ago

Round the answer to the nearest hundredth.

aniked [119]

Answer is 5.85 see picture

5 0

3 years ago

25 points to whoever can answer this question !

topjm [15]

When multiplying fractions, multiply straight across:

(-3/7) (6/5) =

(-3 * 6) / (7*5)=

-18/35

The answer is B.

3 0

3 years ago

Read 2 more answers

Hugo and Viviana work in an office with ten other coworkers. Out of these 12 workers, their boss needs to choose a group of five

Colt1911 [192]

Answer: There are 252 different working groups of five that can be formed.

Step-by-step explanation:

Since we have given that

Number of workers = 12

Number of group of people to work together on a project = 5

Since Hugo and Viviana absolutely refuse, under any circumstances, to work together.

So, remaining number of workers = 12-2=10

so, we need to find the number of different groups of five that can be formed.

We will use "Combination":

$^{10}C_5\\\\=252$

Hence, there are 252 different working groups of five that can be formed.

8 0

4 years ago