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3 years ago

Solve this trinomial Z^2 + z = -20

Mathematics

1 answer:

Naddik [55]3 years ago

4 0

Answer:

your answer is a complex number making your question wrong

Step-by-step explanation:

First z²+z+20=0, just to make it a quadratic equation, so we can use the quadratric formula:

x=( -b±√b²-4ac)/2a

so to find a b and c we compare

YOUR QUESTION SHOULD BE Z² +Z-20=O.

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Cost of admission to a town fair was $8 for adults and $5 for children. If 206 people

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3 years ago

An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 160 engines

abruzzese [7]

Answer:

Test statistic Z = 2.1097

Step-by-step explanation:

Step(i):-

Given that size of the sample 'n' = 160

Given that mean of the Population(μ) = 5.3pounds/square inch

The Standard deviation of the population(σ) = 0.6

Mean of the sample(x⁻) = 5.4

Level of significance =0.1

Step(ii):-

Test statistic

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

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Final answer:-

Test statistic Z = 2.1097

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3 years ago

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algol [13]

Answer:

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Step-by-step explanation:

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3 years ago

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Answer:

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Step-by-step explanation:

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Answer:

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