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3 years ago

Help show work pleaeee

Mathematics

2 answers:

Inga [223]3 years ago

7 0

SA = 2 $\pi rh$ +2 $\pi$ $r^2$

1. Find the radius.

R = 1/2D

6 x 1/2 = 3

R = 3

2. Plug them in.

SA 2(3.14)(3)(7) + 2(3.14)(3^2)

3. Solve

3 x 7 = 21

21 x 3.14 = 65.94

65.94 x 2 = 131. 88

3^2 = 9

9 x 3.14 = 28.26

28.26 x 2 = 56.52

4. Add them together.

131.88 + 56.52 = 188.4

Answer: 188.4 square millimeters

stepan [7]3 years ago

5 0

Answer:

169.52

Step-by-step explanation:

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Fun Tees is offering a 30% discount on all merchandise. Find the discounted price of a T-shirt originally priced at $16. Solve i

frozen [14]

Answer:

Step-by-step explanation:

Discount = % discount × cost price given.

Discounted price = cost price - discount

% discount = 30%

cost price given = $16

Discount = % discount × cost price given.

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Giveaway price = $16 - $4.8

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7 0

3 years ago

A physicist examines 25 water samples for nitrate concentration. The mean nitrate concentration for the sample data is 0.165 cc/

xz_007 [3.2K]

Answer:

The 80% confidence interval for the the population mean nitrate concentration is (0.144, 0.186).

Critical value t=1.318

Step-by-step explanation:

We have to calculate a 80% confidence interval for the mean.

The population standard deviation is not known, so we have to estimate it from the sample standard deviation and use a t-students distribution to calculate the critical value.

The sample mean is M=0.165.

The sample size is N=25.

When σ is not known, s divided by the square root of N is used as an estimate of σM:

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The degrees of freedom for this sample size are:

$df=n-1=25-1=24$

The t-value for a 80% confidence interval and 24 degrees of freedom is t=1.318.

The margin of error (MOE) can be calculated as:

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Then, the lower and upper bounds of the confidence interval are:

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The 80% confidence interval for the population mean nitrate concentration is (0.144, 0.186).

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3 years ago

If someone could answer this correctly I will Venmo you $15

Gelneren [198K]

Answer:

Step-by-step explanation:

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3 years ago

Identify the transformation that carries the figure onto itself.

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Rotation as you could rotate it 360 degrees back into its original place

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4 years ago

You drive 150 miles in 3 hours before stopping for 30 minutes to have lunch and gas. After lunch you travel 100 miles in an hou

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Average speed = total miles driven / total driving time
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250 / (4 1/2) =
250 / (9/2) =
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3 years ago