3 years ago

Help please! Solve the system of equations.

Mathematics

1 answer:

Lelu [443]3 years ago

7 0

2 * x = 2 * 3 = 6

9 * y = 9 * 2 = 18

18 + 6 = 24

x = 3

y = 2

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3 years ago

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Nastasia [14]

Answer:

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Step-by-step explanation:

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How many positive integers not exceeding 1000 are not divisible by either 4 or 6?

san4es73 [151]

$\left\lfloor\dfrac{1000}4\right\rfloor=250$

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3 years ago

Read 2 more answers

A random sample of 56 lithium batteries has a mean life of 645 hours with a population standard deviation of 31 hours. Compute t

bearhunter [10]

Answer: A. (636.9, 653.1)

Step-by-step explanation:

Given : Sample size : n=56

Significance level : $\alpha: 1-0.95=0.05$

Critical value : $z_{0.05}=1.96$

Sample mean : $\overline{x}=645\text{ hours}$

Standard deviation : $\sigma= 31\text{ hours}$

The 95% confidence interval for population mean is given by :-

$\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}\\\\=645\pm (1.96)\dfrac{31}{\sqrt{56}}\\\\=645\pm8.1\\\\=(636.9, 653.1)$

Hence, 95% confidence interval for population mean is (636.9, 653.1).

8 0

3 years ago

Help please! Solve the system of equations. ​

Help please! Solve the system of equations.