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2 years ago

Four times the reciprocal of a number equal 2 times the reciprocal of 8

Mathematics

1 answer:

garik1379 [7]2 years ago

5 0

Answer:

Step-by-step explanation:

Let the number be y & reciprocal simply means inverse of the number

4×1/y=2×1/8 solving for y

4/y=2/8; y = 16

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Calibrating a scale:

lana66690 [7]

Answer:

We conclude that the calibration point is set too high.

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 1000 grams

Sample mean, $\bar{x}$ = 1001.1 grams

Sample size, n = 50

Alpha, α = 0.05

Population standard deviation, σ = 2.8 grams

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 1000\text{ grams}\\H_A: \mu > 1000\text{ grams}$

We use One-tailed(right) z test to perform this hypothesis.

Formula:

$z_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{\sigma}{\sqrt{n}} }$

Putting all the values, we have

$z_{stat} = \displaystyle\frac{ 1001.1 - 1000}{\frac{2.8}{\sqrt{50}} } = 2.778$

Now, $z_{critical} \text{ at 0.01 level of significance } = 2.326$

Since,

$z_{stat} > z_{critical}$

We reject the null hypothesis and accept the alternate hypothesis. We accept the alternate hypothesis. We conclude that the calibration point is set too high.

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2 years ago

X/7=21 what is the answer

Tems11 [23]

here is the answer x = -147

Hope its the answer

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3 years ago

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If y varies directly with x, and y=-1 when x=3

UNO [17]

Answer:

where da question at

Step-by-step explanation:

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3 years ago

A dilation with a scale factor of 15 and centered at the origin is applied to MN¯¯¯¯¯¯¯ with endpoints M(−2, −4) and N(1, 5) .

Nutka1998 [239]

coordinates m' is going to be (-2/5,-4/5)

coordinates n' is going to be (1/5,1)

I just took the test i hope this helps!

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3 years ago

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A property sells for $620,000 two years after it was purchased. If the annual appreciation rate was 4%, how much did the origina

8090 [49]

$25,000 is the answer you would take $620,000 x 0.04 (4%)= 24,800 which rounds to 25,000

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2 years ago

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