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2 years ago

I need some help on this

Mathematics

1 answer:

LiRa [457]2 years ago

4 0

Answer:

B. (5, ∞)

Step-by-step explanation:

The correct answer choice is marked.

The absolute value function increases to the right of its vertex. Here, the vertex has been moved to (x, y) = (5, 2). This means the function is increasing for 5 < x.

In interval notation, the domain of increase is (5, ∞).

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3 years ago

1A technical magazine stated that the mean retail cost of all models of a particular laptop was $600. A random sample of 10 stor

My name is Ann [436]

Answer:

Yes

Step-by-step explanation:

Given,

Population mean Z = 600

Sample mean, µ = 586.50

Size of the sample, n = 10

Standard deviation, σ = 26.77

The testing hypothesis is,

Null hypothesis = µ<600

Alternative hypothesis = µ≥600

The test statistics is the calculated value of Z,

(Z- µ)/(σ/√n)

= (600-586.50)/(26.77/√10)

= (13.5*3.1623)/26.77

= 42.691/26.77

= 1.5947

And at 5% level of significance, the table value of Z = 1.644

Here, calculated Z<Table value of Z, so we accept the null hypothesis.

So, the null hypothesis is accepted. The mean value of the laptop is less than 600.

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3 years ago

HELPPP PLS ILL GIVE BRAINLESS SHOW WORK

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3 years ago

√2 times √800 anyone know?

jeka94

$\sqrt{2} \times \sqrt{800}$

$\sqrt{2} \times 20 \sqrt{2}$

$\sqrt{2} \times \sqrt{2} = \sqrt{4} \: = 2$

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$therefore \: \: \: \sqrt{2} \times \sqrt{800} = 40$

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