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3 years ago

140 converted to kilometres

Mathematics

1 answer:

yuradex [85]3 years ago

3 0

225.30816
Hope this helped :)))

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What is the value of 3(4x+5y) - 2(7x-3y) when x = -2 and y = 3

Shkiper50 [21]

Answer:

Step-by-step explanation:

Subsitute both given values into the equation then continue to simplify the equation

3(4(-2)+5(3)) -2(7(-2)-3(3))

3(-8+15) -2(-14-9)

3(7) -2(-23)

21 +46

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3 years ago

Read 2 more answers

Is 7.29 a rational number?

ExtremeBDS [4]

Answer:

Yes

Step-by-step explanation:

A rational number is a number that can be expressed as a fraction. In this case, the fraction is being expressed by a decimal. So therefore 7.29 is a rational number.

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4 years ago

10 The table shows the cost of blueberries at a local farmer's

egoroff_w [7]

Answer:

This question needs rephrasing. It makes no sense.

Step-by-step explanation:

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3 years ago

Estimate first, and then solve using the standard algorithm. Show how you rename the divisor as a whole number. 6.39 ÷ 0.09

Talja [164]

Answer:

Step-by-step explanation:

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3 years ago

Find the size of each of two samples (assume that they are of equal size) needed to estimate the difference between the proporti

hodyreva [135]

Answer:

The sample size n = 4225

Step-by-step explanation:

We will use maximum error formula = $\frac{z_{a} S.D}{\sqrt{n} }$

but we will find sample size "n"

$\sqrt{n} = \frac{z_{a} S.D}{maximum error}$

Squaring on both sides , we get

$n = (\frac{z_{a} S.D}{maximum error})^2$

Given 99% confidence interval (z value) = 2.56

given maximum error = 0.02

$n = (\frac{z_{a} p(1-p)}{maximum error})^2$

n≤ $(\frac{2.56X\frac{1}{2} }{0.02}) ^{2}$ ( here S.D = p(1-p) ≤ 1/2

on simplification , we get n = 4225

<u>Conclusion</u>:

The sample size of two samples is n = 4225

<u>verification</u>:-

We will use maximum error formula = $\frac{z_{a} S.D}{\sqrt{n} }$ = $\frac{2.56 1/2}{\ \sqrt{4225} }$ = 0.0196

substitute all values and simplify we get maximum error is 0.02

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3 years ago