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Scilla [17]
3 years ago
10

Work out the total surface area of this hemisphere which has a radius of 8cm.

Mathematics
1 answer:
Masja [62]3 years ago
4 0

\bf \textit{surface area of a sphere}\\\\ SA=4\pi r^2~~ \begin{cases} r=radius\\ \cline{1-1} r=8 \end{cases}\implies SA=4\pi (8)^2\implies SA=256\pi \\\\\\ \stackrel{\textit{half of that for a \underline{hemi}sphere}}{\cfrac{256\pi }{2}\implies 128\pi \implies }\stackrel{\textit{rounded up}}{402.1}

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What is a common denominator for ⅜ and ⅔​
il63 [147K]

Answer:

24 is the simplest common denominator of 3 and 8

Step-by-step explanation:

24 is the first time they can become equal without becoming a decimal

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8 0
3 years ago
An element with mass 430 grams decays by 27.4% per minute. How much of the element is remaining after 19 minutes, to the nearest
nadya68 [22]
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7 0
3 years ago
Help.‼️ its rlly hard
Tpy6a [65]

Answers:

Rent = 750

Savings = 750

Groceries = 625 (you are correct)

Other = 375

========================================

Explanation:

Convert each percent to decimal form. You do this by moving the decimal point 2 spots to the left.

Rent has 30% turn into 0.30, which multiplies with 2500 to get 0.30*2500 = 750

For savings, the same multiplier is used because we also have 30% here as well. So the same amount is devoted to savings.

You have the correct answer for groceries. Multiply 0.25 with 2500 to get 625. Nice work on getting the correct answer here.

Finally, we have 15% devoted to other, so we multiply 0.15 by 2500 and we get 0.15*2500 = 375

As a check, we can add up the subtotals 750, 750, 625, 375 to get 750+750+625+375 = 2500 which helps us confirm our answers.

8 0
3 years ago
Read 2 more answers
The area of a square garden is 1/144mi^2. How long is each side
nata0808 [166]
<span>P=22 ft. 
A=LxW
A=(5ft)(6ft)
A=30ft^2 

That's your answer.

</span>
8 0
3 years ago
Please answer this quick!I'm running out of time!
const2013 [10]
60%. That is the probability.
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