4 years ago

Fractions. answer the question EXPLAIN.

Mathematics

1 answer:

goblinko [34]4 years ago

5 0

Here is the answer to the problem with working out

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A rope is 225 centimeters long you need the rope to be 1 1/2 meters long how many centimeters should you cut off

Leviafan [203]

That would be 75 centimeters

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3 years ago

A 95 percent confidence interval for the mean of a population is to be constructedand must be accurate within 0.3 unit. A prelim

jarptica [38.1K]

Answer:

B. 359

Step-by-step explanation:

Given that:

The margin of error (e) must be within 0.3 unit, The standard deviation (σ) = 2.9 and the the confidence level = 95% = 0.95

α = 1 =0.95 = 0.05

$\frac{\alpha}{2}=\frac{0.05}{2}=0.025$

The z score of 0.025 corresponds to the z score of 0.0475 (0.5 - 0.025) which can be gotten from the normal probability table.

Therefore: $z_\frac{\alpha}{2}= z_{0.025}=1.96$

The formula for the margin of error is given by:

$e=z_{0.025}\frac{\sigma}{\sqrt{n} } \\Substituting:\\0.3=1.96*\frac{2.9}{\sqrt{n} } \\\sqrt{n}=\frac{1.96*2.9}{0.3}\\\sqrt{n} =18.95\\ n=18.95^2=359$

Therefore the smallest sample size (n) is 359

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3 years ago

What is -15x=-240?????????

Vlad [161]

You divide -15 on both sides to keep the x alone
-240/ -15=16
A negative divided by a negative is a positive so x=16

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3 years ago

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on monday, 251 students went on a trip to the zoo.all 5 buses were filled and 6 students had nto travel in cars.how many student

Norma-Jean [14]

Answer: 49

Step-by-step explanation:

251-6=245

245/5=49

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3 years ago

Find the measure of each angle:

Mrac [35]

Supplementary angles sum up to 180 degrees.

2x - 4 + 2x + 4 = 180
4x = 180
x = 45

Therefore,
m<9 = 2(45) - 4 = 90 - 4 = 86 degrees
m<10 = 2x + 4 = 90 + 4 = 94 degrees.

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3 years ago

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