3 years ago

Please help me with this homework

Mathematics

1 answer:

Oliga [24]3 years ago

7 0

Answer:

2-0

_____

-8-(-1)

explanation:

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9/5+3/1

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3 years ago

I’ve been struggling pls help i will kiss u. !!4?2737/!4

Snezhnost [94]

Answer:

The correct answer is C

Step-by-step explanation:

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Which of these strategies would eliminate a variable in the system of equations?

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3 years ago

Jazmin is training for an upcoming race at the track. On Monday, she ran 8 laps around the track, which equals 2. On Wednesday s

SpyIntel [72]

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5 miles

Step-by-step explanation:

8 laps around the track equal two miles so 8÷2=4. This means that one mile equals 4 laps. So, 20 laps is equal to 5 miles because 20÷4=5.

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3 years ago

A lab is testing the amount of a certain active chemical compound in a particular drug that has been recently developed. The man

Mazyrski [523]

Answer:

The 95% confidence interval is "87.94, 91.86".

Step-by-step explanation:

The given values are:

Sample batches,

n = 25

Sample mean concentration,

$\bar{x}$ = 89.9 mg

Amount of chemical,

σ = 5

α = 0.05

The critical value from Z table will be:

= $Z(\frac{\alpha}{2} )$

= $Z(\frac{0.05}{2} )$

= $1.96$

Now,

The confidence interval will be:

= $\bar{x} \pm Z(\frac{\alpha}{2} )\times \frac{\sigma}{\sqrt{n} }$

On substituting the values, we get

= $89.9 \pm Z(\frac{0.05}{2})\times \frac{5}{\sqrt{25}}$

= $89.9 \pm Z(\frac{0.05}{2})\times \frac{5}{5}$

= $89.9 \pm1.96\times 1$

Lower limit will be:

= $89.9 -1.96\times 1$

= $87.94$

Upper limit will be:

= $89.9 +1.96\times 1$

= $91.86$

7 0

3 years ago