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2 years ago

Evaluate WITHOUT a calculator. Answer in scientific notation.(3•10^9) (5•10^6)

Mathematics

1 answer:

alexandr402 [8]2 years ago

8 0

Answer:

15*10^15

Step-by-step explanation:

5*10^6= 5*1,000,000

5*1,000,000=5,000,000

3*10^9=3*1,000,000,000=3,000,000,000

5,000,000*3,000,000,000=15,000,000,000,000,000

15*10^15=15,000,000,000,000,000

Hope this helps

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A cube and a square pyramid were joined to form the composite solid. A cube with side lengths of 12 inches. A square pyramid wit

Zepler [3.9K]

Answer:

total surface area = 936 in²

Step-by-step explanation:

total surface area = surface area of the pyramid + surface area of the cube

1. surface area of the pyramid = 4 * area of lateral triangle side

area of lateral triangle side = 12 * 9 /

area of lateral triangle side = 54 in²

2. surface area of the pyramid = 4 * 54

surface area of the pyramid = 216 in²

3. surface area of the cube = 5 * (12 x 12)

-surface area of the cube = 720 in²

therefore, the total surface area = 216 in² + 720 in²

total surface area = 936 in²

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3 years ago

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Randomly selected students participated in an experiment to test their ability to determine when one minute (or sixty seconds)

zalisa [80]

Answer: $(57.41,\ 62.19)$

Step-by-step explanation:

Given : Sample size : $n=40$

Sample mean : $\overline{x}=59.8\text{ seconds}$

Standard deviation : $\sigma =9.2\text{ seconds}$

Significance level : $\alpha=1-0.9=0.1$

Critical value : $z_{\alpha/2}=1.645$

Formula to find the confidence interval for population mean :-

$\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}\\\\=59.8\pm(1.645)\dfrac{9.2}{\sqrt{40}}\\\\\approx59.8\pm2.39\\\\=(59.8-2.39,\ 59.8+2.39)\\\\=(57.41,\ 62.19)$

Hence, a 90% confidence interval estimate of the population mean of all students = $(57.41,\ 62.19)$

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2 years ago

Rob is two times as old as Jake. Three years ago the sum of their ages was 21 years. Find their present ages?

spin [16.1K]

Rob is 18
Jake is 9

21-15=6
6+3=9
9x2=18
(No clue how I got 15 )

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3 years ago

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<img src="https://tex.z-dn.net/?f=%20%5Csqrt%7B32%7D%20" id="TexFormula1" title=" \sqrt{32} " alt=" \sqrt{32} " align="absmiddle

hammer [34]

The answer to sqrt 32, simplified is 4sqrt2.

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2 years ago

Put these numbers in order from least to greatest. 0.57 5.07 50.7 57 75

nordsb [41]

Answer:

It's basically already in order: 0.57, 5.07, 50.7, 57, 75

Step-by-step explanation:

Hope it helps! :3

Plz mark as brainliest!

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2 years ago

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Evaluate WITHOUT a calculator. Answer in scientific notation.(3•10^9) (5•10^6)​

Evaluate WITHOUT a calculator. Answer in scientific notation.(3•10^9) (5•10^6)