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3 years ago

PLEASE HELP ME 10 POINTS

Mathematics

2 answers:

Ksenya-84 [330]3 years ago

7 0

Answer:

it is hard to read... can you get a better picture or describe it?

Ksju [112]3 years ago

3 0

Answer:

Step-by-step explanation:

supposing this is with replacement, you find the probability of choosing rock songs which is rock/all the songs aka 3/(3+3+2)=3/8

now that we know the probability of choosing one rock song, since its twice we multiply by itself

3/8 x 3/8= 9/64

you can't simplify this fraction so the answer is 9/64

you welcome

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Is calculating his expenses from his work trip to San Francisco. Below is the expense log he kept while traveling.

Alika [10]

Answer:

Step-by-step explanation:

379.00 - 15.00 + 154.00 x 3 + 65.00 + 13.00 = 904

0.55 x 63 = 34.65

34.65 + 904 = 938.65

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2 years ago

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The square below has an area of x^2+10x+25 square meters. What expression represents the length of one side of the square?

Andre45 [30]

(x+5) represents each side of a square. Since all sides of a square are equal, we know that all sides are (x+5).

Base x height = (x+5)(x+5)

Which is x^2+10x+25!

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3 years ago

The radius of a cylindrical construction pipe is 1.5ft . If the pipe is 14ft long, what is its volume? Use the value 3.14 for π

Lady bird [3.3K]

Answer:

Volume of cylinder =989 ft cube

Step-by-step explanation:

<u>Volume of cylinder</u>

Volume V = πr²h

r - radius and h - height

It is given that,

The radius of a cylindrical construction pipe is 1.5ft and

Length of pipe = 14 ft

<u>To find volume of cylinder</u>

Volume V = πr²h

V = 3.14 x 1.5 x1.5 x 14 =989.1 ≈ 989 ft cube

5 0

2 years ago

Answer true or false to each statement concerning a confidence interval for a population mean. Give reasons for your answers. a.

Rainbow [258]

Answer:

(a) True

(b) True

(d) True

Step-by-step explanation:

The general form of a confidence interval is:

$CI=SS\pm MOE$

Here,

SS = Sample statistic

MOE = margin of error

The formula to compute the MOE is:

$MOE=\frac{length}{2}$

Here, length implies the length of the confidence interval.

(a)

The statement is:

"The length of a confidence interval can be determined if you know only the margin of error."

The length of the confidence interval is twice the MOE.

So, yes one can compute the length of the confidence interval if they know the value if MOE.

The statement is True.

(b)

The statement is:

"The margin of error can be determined if you know only the length of the confidence interval."

The margin of error of the confidence interval is half the length.

So, yes one can compute the MOE if they know the length of the confidence interval.

The statement is True.

(c)

The statement is:

"The confidence interval can be obtained if you know only the margin of error."

The confidence interval formula is:

$CI=SS\pm MOE$

So, if we only knew the value of MOE we cannot compute the confidence interval. We will also need the value of the sample statistic.

The statement is False.

(d)

The statement is:

"The confidence interval can be obtained if you know only the margin of error and the sample mean"

The confidence interval formula is:

$CI=SS\pm MOE$

So, if we knew the value of MOE and the sample statistic we can compute the confidence interval.

The statement is True.

5 0

2 years ago

After four years in college, Josie owes $21000 in student loans. The interest rate on the federal loans is 3% and the rate on th

klasskru [66]

Answer:

$104.27 is the amount at 3% and $20895.73 is the amount at 4.4%

Step-by-step explanation:

We are given that Josie owes $21000 in student loans.

Let x be principal at 3% rate of interest

Time = 1 year

Formula: $A=P(1+r)^t$

$A=x(1+0.03)^1$

A=1.03x

Interest = Amount - Principal

Interest = 1.03x-x=0.03x

So, (21000-x) is the principal at 4.4% rate of interest

Formula: $A=P(1+r)^t$

$A=(21000-x)(1+\frac{4.4}{100})^1$

A=21924-1.044x

Interest = 21924-1.044x-21000-x=924-2.044x

The total interest she owes for one year was $714.00

So, 0.03x+924-2.044x=714

x=104.27

So, $104.27 is the amount at 3%

The principal at 4.4% rate of interest =21000-x=21000-104.27=20895.73

Hence $104.27 is the amount at 3% and $20895.73 is the amount at 4.4%

7 0

2 years ago