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3 years ago

Solve for x. Write your answer as “x=__”

Mathematics

1 answer:

BabaBlast [244]3 years ago

3 0

Answer:

9x+3x=12x

180/12=15

9 x 15= 135

3 x 15= 45

135+45=180

x=15

Step-by-step explanation:

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Can someone help wit this just find the value of x

Romashka-Z-Leto [24]

2x-2+x+5=90
3x+3=90
-3 -3
3x/3 =87/3
x=29

6 0

3 years ago

Given two independent random samples with the following results: n1=8x‾1=186s1=33 n2=7x‾2=171s2=23 Use this data to find the 90%

KonstantinChe [14]

Answer:

The point of estimate for the true difference would be:

$186-171= 15$

And the confidence interval is given by:

$(186-171) -1.77 \sqrt{\frac{33^2}{8} +\frac{23^2}{7}}= -10.753$

$(186-171) +1.77 \sqrt{\frac{33^2}{8} +\frac{23^2}{7}}= 40.753$

Step-by-step explanation:

For this case we have the following info given:

$\bar X_1 = 186$ the sample mean for the first sample

$\bar X_2 = 171$ the sample mean for the second sample

$s_1 =33$ the sample deviation for the first sample

$s_2 =23$ the sample deviation for the second sample

$n_1 = 8$ the sample size for the first group

$n_2 = 7$ the sample size for the second group

The confidence interval for the true difference is given by:

$(\bar X_1 -\bar X_2) \pm t_{\alpha/2}\sqrt{\frac{s^2_1}{n_1} +\frac{s^2_2}{n_2}}$

We can find the degrees of freedom are given:

$df = n_1 +n_2 -2 =8+7-2= 13$

The confidence level is given by 90% so then the significance would be $\alpha=1-0.9=0.1$ and $\alpha/2=0.05$ we can find the critical value with the degrees of freedom given and we got:

$t_{\alpha/2}= \pm 1.77$

The point of estimate for the true difference would be:

$186-171= 15$

And replacing into the formula for the confidence interval we got:

$(186-171) -1.77 \sqrt{\frac{33^2}{8} +\frac{23^2}{7}}= -10.753$

$(186-171) +1.77 \sqrt{\frac{33^2}{8} +\frac{23^2}{7}}= 40.753$

5 0

3 years ago

If 16 to the power of x = 1/64. what is the value of x?

zimovet [89]

Answer:

$\: \: \: \: \: \: \: \: {16}^{x} = \frac{1}{64} \\ = > {2}^{4x} = \frac{1}{ {2}^{6} } \\ = > {2}^{4x} = {2}^{ - 6} \\ = > 4x = - 6 \\ = > x = \frac{ - 6}{4} \\ = > x = \frac{ - 3}{2}$

5 0

3 years ago

Read 2 more answers

Jonah is mowing lawns for a summer job. For every mowing job, he charges an

Mkey [24]

Answer:

It would be 10 dollars

Step-by-step explanation:

6x8=48

58-48=10

6 0

3 years ago

Can u help me solve 8-3(7-4y) i know the answer i just need to kown how i got the answer

VARVARA [1.3K]

8 - 3(7-4y)
8 - (3x7 - 3x4y) You need to develop between parentheses bcs there is a minus between 8 and 3.
8 - (21 - 12y)
8 - 21 + 12y /!\ A minus before parentheses changes the sign in the parentheses !
12y - 13

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3 years ago