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3 years ago

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help please quick

Mathematics

1 answer:

RSB [31]3 years ago

6 0

Isolate the variable by dividing each side by factors that don't contain the variable.

x= 13/4 - y/4

If you are solving for x (only)
X = 45/4 - y/4

If you are solving for y (only)
Y= 45- 4x

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m_a_m_a [10]

Answer:

The calculated value Z = 1.8823 <1.96 at 0.05 level of significance

The average amount of energy used in his factory per day has changed since last year.

Step-by-step explanation:

Step(i):-

Given that mean of the Population = 2000 (MWH)

Given that size of the sample 'n' = 400

Given that mean of sample x⁻ = 2040 MWH

Given that the standard deviation = 425 MWH per day

Step(ii):-

Null hypothesis:H₀: μ = 2000 (MWH)

Alternative Hypothesis:H₁: μ≠ 2000( MWH)

Test statistic

$Z = \frac{x^{-}-mean }{\frac{S.D}{\sqrt{n} } }$

$Z = \frac{2040-2000}{\frac{425}{\sqrt{400} } }$

Z = 1.8823

The calculated value Z = 1.8823 <1.96 at 0.05 level of significance

Final answer:-

The calculated value Z = 1.8823 <1.96 at 0.05 level of significance

The average amount of energy used in his factory per day has changed since last year.

3 0

2 years ago

If 12% of x is 72 and 1/8 of y is 16 what is the value of x-y

expeople1 [14]

Answer:

x is 600 and y is 128:

so the answer is 472!

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2 years ago

Which of the following give the highest future value is 6000000 is invested at 6% for 3 years

Blababa [14]

Answer:

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Step-by-step explanation:

Given data

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Now let us find the initial amount which is the principal

using the simple interest formula we have

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6000000 =P*1.18

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Step-by-step explanation:

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The answer is A which is 113. Hope this helped

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3 years ago

Read 2 more answers