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3 years ago

Which of the following expressions results in a positive number?

Mathematics

2 answers:

arlik [135]3 years ago

6 0

Answer:

-30(-8)

Step-by-step explanation:

A negative times a negative always equals a positive.

Salsk061 [2.6K]3 years ago

6 0

-30(-8)
This give you an answer of 240

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Why should you use the mean and mean absolute deviation (MAD) to compare populations with symmetrical distributions? The mean an

Lesechka [4]

Answer:

The answer is C i think

Step-by-step explanation:Ya it is i took the pre quiz thing

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3 years ago

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How many solutions does the system of equations have 3x=-12+15 and x + 4y =5

Sphinxa [80]

Answer:

infinitely many solutions

Step-by-step explanation:

I assume that you meant

3x = -12y + 15 and x + 4y =5 (you accidentally omitted the 'y')

Multiplying the second equation by 3 yields

3x + 12y = 15

... which is identical to the first equation. Thus, the two lines coincide, and we conclude that there are infinitely many solutions.

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3 years ago

Help a beaner out!!!

hammer [34]

Answer:

i believe the other side is the 50 or 60 in length

Step-by-step explanation:

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3 years ago

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N =64

faust18 [17]

Answer:

B. 1.70

Step-by-step explanation:

Given:

$n=64$
$\overline{x}=65.1$
$\sigma=24$
$\textsf{h}_0:\mu=60$
$\textsf{h}_1:\mu\neq 60$

$\textsf{If }\: X \sim\textsf{N}(\mu,\sigma^2)\:\textsf{ then }\: \overline{X} \sim \left(\mu,\dfrac{\sigma^2}{n}\right) \implies Z=\dfrac{\overline{X}-\mu}{\sigma / \sqrt{n}} \sim \textsf{N}(0,1)$

$\textsf{then test statistic is}: \quad z=\dfrac{\overline{x}-\mu}{\sigma / \sqrt{n}}$

Substituting the given values into the formula to find the test statistic z:

$\begin{aligned}\implies z &=\dfrac{65.1-60}{24 / \sqrt{64}}\\\\&=\dfrac{5.1}{3}\\\\&=\dfrac{17}{10}\\\\&=1.7\end{aligned}$

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2 years ago

Is -8 a rational number ?

Alona [7]

a rational number is a number that can be expressed as a fraction where both the numerator and the denominator in the fraction are integers. The denominator in a rational number cannot be zero. ... In other words, most numbers are rational numbers.

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4 years ago

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