1/4 (8b-80) +b = 70 what is the value of b

2 answers:

5 0

First of all, you’ve a fraction in your equation, accompanied by a value that needs to be added. This, you can not directly shift (+b) to the other side.
As you’ve got two values in brackets being multiplied by one quarters too, you multiply them to obtain:

[8b-80]
———— + b = 70
4

To add b into our fraction, we must make a common denominator, and so we multiply b over 1 with 4 on both the numerator & denominator, obtaining:

[8b-80+4b]
—————— = 70
4

From here, it is simple. You shift the 4 to the other side, multiplying it with 70 to get 280. Shift the negative 8 to the other side, making it positive while doing so, and add that to 280, obtaining 288. Now you only have 12b=288, so you divide both sides of the equation with 12, leaving you with 24.

son4ous [18]3 years ago

4 0

Answer:

b = 30

Step-by-step explanation:

1/4 (8b-80) +b = 70

2b - 20 + b = 70

3b = 90

b = 30

You might be interested in

M find b a) not triangle b)11in c)14in d)13in

Alexxx [7]

Answer:

kantut

Step-by-step explanation:

kantut kalimot hahaha you have a great day to be out of town for a few days now and then I can go to be a great day for a few days now and then I can go to be a great day for you want to be a great day to lapu lapu to get a

4 0

3 years ago

Bogdan [553]

Answer:

3 gallons of orange juice

8 0

3 years ago

Read 2 more answers

Suppose that a recent article stated that the mean time spent in jail by a first-time convicted burglar is 2.5 years. A study wa

4vir4ik [10]

Using the z-distribution, it is found that since the test statistic is greater than the critical value, it can be concluded that the mean length of jail time has increased.

At the null hypothesis, it is tested if the mean length of jail time is still of 2.5 years, that is:

$H_0: \mu = 2.5$

At the alternative hypothesis, it is tested if it has increased, that is:

$H_1: \mu > 2.5$

We have the standard deviation for the population, thus, the z-distribution is used. The test statistic is given by:

$z = \frac{\overline{x} - \mu}{\frac{\sigma}{\sqrt{n}}}$

The parameters are:

$\overline{x}$ is the sample mean.
$\mu$ is the value tested at the null hypothesis.
$\sigma$ is the standard deviation of the sample.
n is the sample size.

For this problem, the values of the parameters are: $\overline{x} = 3, \mu = 2.5, \sigma = 1.5, n = 26$

Hence, the value of the test statistic is:

$z = \frac{\overline{x} - \mu}{\frac{\sigma}{\sqrt{n}}}$

$z = \frac{3 - 2.5}{\frac{1.5}{\sqrt{26}}}$

$z = 1.7$

The critical value for a right-tailed test, as we are testing if the mean is greater than a value, with a significance level of 0.05, is of $z^{\ast} = 1.645$