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uranmaximum [27]
3 years ago
9

(4x−9x)(12+8x)=9(4x) Which of the following would be the best first step for Bianca to take?

Mathematics
1 answer:
Ilya [14]3 years ago
4 0

Answer: x=0 or x= −12 5

Step-by-step explanation:

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Solve the inequality and graph its solution on a number line a - 3 > -7
Ira Lisetskai [31]

Answer:

B

Step-by-step explanation:

a-3>-7

collect like terms

a>-3-7

a>-10

6 0
3 years ago
Who want to play call of duty mobile?​
VashaNatasha [74]

Answer:

im takin the points ty

Step-by-step explanation:

6 0
3 years ago
It is important that face masks used by firefighters be able to withstand high temperatures because firefighters commonly work i
Salsk061 [2.6K]

Answer:

(-\infty, 0.2661)

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

The population proportion have the following distribution

p \sim N(p,\sqrt{\frac{p(1-p)}{n}})

n=60 represent the sample size  

X=12 represent the number of masks that had lenses pop out at 250°

\hat p =\frac{12}{60}=0.2 represent the estimated proportion of masks that  had lenses pop out at 250°

p represent the population proportion of masks that  had lenses pop out at 250°

Confidence =0.9 or 90%

\alpha=0.1 represent the significance level

Confidence interval

On this case we want a interval on this form : (-\infty,\hat p +z_{\alpha}\sqrt{\frac{\hat p (1-\hat p)}{n}})

So the critical value would be on this case z_{\alpha}=1.28 and we can use the following excel code to find it: "=NORM.INV(1-0.1,0,1)"

We found the lower limit like this:

0.2 +1.28\sqrt{\frac{0.2 (1-0.2)}{60}}=0.2661

And the interval would be: (-\infyt, 0.2661)

3 0
3 years ago
∠E and ∠F are vertical angles with m∠E=9x+12 and m∠F=3x+24. What is the value of x?
statuscvo [17]

Answer:

  • x = 2

Step-by-step explanation:

<em>Vertical angles are equal as per definition.</em>

  • ∠E and ∠F are vertical angles
  • m∠E = 9x+12 and m∠F = 3x+24
  • x = ?

<u>Solution</u>

  • 9x+12 = 3x+24
  • 9x - 3x = 24 - 12
  • 6x = 12
  • x = 2

4 0
3 years ago
Please help with this having trouble keep getting it wrong
olga2289 [7]

Answer:

40?

Step-by-step explanation:

multiply by 2  since 30/15=2

2x20=40

srry if wrong but

hope this helps

take care

8 0
3 years ago
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