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2 years ago

PLEASE HELP!!! DESPERATE!!! MATHS!!! WILL AWARD BRAINLIEST!!!

Mathematics

1 answer:

Veronika [31]2 years ago

8 0

Answer:

x axis is = (0,4)

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Which expression is the simplest form of (27x^-9)^1/3?

lana [24]

$\sqrt[n]{a^m}=a^\frac{m}{n}\\\\\sqrt[n]{a}=a^\frac{1}{n}\\\\(a^n)^m=a^{nm}\\\\(a\cdot b)^n=a^n\cdot b^n\\\\(27x^{-9})^\frac{1}{3}=27^\frac{1}{3}(x^{-9})^\frac{1}{3}=\sqrt[3]{27}\cdot x^{-9\cdot\frac{1}{3}}=3x^{-3}=\dfrac{3}{x^3}$

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3 years ago

Mathematical Statistics with Applications Help Homework

Mars2501 [29]

7.43: Let $X$ denote the random variable for height and $\overline X$ for the sample mean. Then if $\mu$ is the mean of

So the probability that the difference between the sample and population means does not exceed 0.5 inch is

$P(|\overline X-\mu|\le0.5) = P\left(\left|\dfrac{\overline X-\mu}{0.25}\right|\le\dfrac{0.5}{0.25}\right) = P(|Z|\le 2) \approx \boxed{0.95}$

per the empirical or 68/95/99.7 rule.

7.44: For a sample of size n, the sample standard deviation would be $\frac{2.5}{\sqrt n}$ . We want to find n such that

$P(|\overline X-\mu| < 0.4) = 0.95$

Comparing to the equation from the previous part, this means we would need

$\dfrac{0.4}{\frac{2.5}{\sqrt{n}}} = 0.16\sqrt n = 2 \implies \sqrt n = 12.5 \implies n = 156.25$

so a sample of at least 157 men would be sufficient.

7 0

2 years ago

Solve the equation, round number the the nearest hundredth if needed.

Elza [17]

12+6/7n=-25n add 25n and subtract 12 on both sides

25 6/7n=-12 convert to improper fraction

181/7n=-12 multiply both sides by seven to clear the fraction

181n=-84 divide both sides by 181 to get your answer

n= -.46 hope that helps..

4 0

3 years ago

Larry, Mary, and Terry each had a full glass of juice. Larry drank 3/4 of his. Mary drank 3/8 of hers. Terry drank 7/10 of his.

KiRa [710]

Answer is Mary because
8/8 is a whole
4/8 is a half
3/8 is less than 1/2

3 0

2 years ago

Read 2 more answers

(16+5i) + (6-7i) How do I solve this?

Fantom [35]

Answer:

$\large\boxed{(16+5i)+(6-7i)=22-2i}$

Step-by-step explanation:

$(16+5i)+(6-7i)=16+5i+6+7i\qquad\text{combine like terms}\\\\=(16+6)+(5i-7i)=22-2i$

5 0

3 years ago

Read 2 more answers