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4vir4ik [10]
3 years ago
7

Please help im so confused?

Mathematics
1 answer:
Setler79 [48]3 years ago
4 0
Surface area =  PI x rL + PI x r^2

since the answer is in terms of PI, remove PI from the equation:

surface are = rl +r^2

r = 3 and l = 15

3*15 + 3^2 = 45 +9 = 54

answer is 54PI units^2

Answer is C

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Nathan is organizing textbooks on his bookshelf. He has a Spanish textbook, a math
Ghella [55]

Answer:

6 ways

Step-by-step explanation:

Given:

Books: Spanish, Maths and History textbooks (1 each)

Required

Determine the number of arrangements

In total, Nathan has 3 books.

The number of arrangements (n) is as follows:

The first book can be lined in 3 ways

The second book can be lined in 2 ways

The third book can be lined in 1 way

So,

n = 3 * 2 * 1

n = 6

3 0
2 years ago
Read 2 more answers
joan reads that the mass of an average elephants brain is 3 4/10 kilograms greater than an average mans brain how many kilograms
Alenkinab [10]

Answer:

hahahhahahhahahahhahahhahahahhahahahhahahahhahahahhahahahahahahhahahahahahahahahahhahahahahahhahahahahahhahahahahahahhahahahahahhahahahahahhahahahahahahhahahahahahhahahahahhahahahhahahahahahahhahahahahhahahahhahahhahahahhahahahhahahahhahahahahhahah

Step-by-step explanation:

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6 0
3 years ago
Parker puts 25 $ of her earnings
solong [7]

Answer:

12 months or a year

Step-by-step explanation:

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8 0
3 years ago
Pumps A, B, and C operate at their respective constant rates. Pumps A and B, operating simultaneously, can fill a certain tank i
jeka94

Let a,b,c be the time it takes for pumps A, B, and C (respectively) to fill 1 tank. Then

\begin{cases}\dfrac1a+\dfrac1b=\dfrac1{\frac65}=\dfrac56\\\\\dfrac1a+\dfrac1c=\dfrac1{\frac32}=\dfrac23\\\\\dfrac1b+\dfrac1c=\dfrac12\end{cases}

Now,

\left(\dfrac1a+\dfrac1b\right)-\left(\dfrac1a+\dfrac1c\right)=\dfrac56-\dfrac23\implies\dfrac1b-\dfrac1c=\dfrac16

Then

\left(\dfrac1b+\dfrac1c\right)+\left(\dfrac1b-\dfrac1c\right)=\dfrac12+\dfrac16\implies\dfrac2b=\dfrac23\implies b=3

This means

\dfrac1a+\dfrac13=\dfrac56\implies\dfrac1a=\dfrac12\implies a=2

and

\dfrac13+\dfrac1c=\dfrac12\implies\dfrac1c=\dfrac16\implies c=6

Working together, all 3 pumps would operate at a rate of

\dfrac1a+\dfrac1b+\dfrac1c=1

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8 0
3 years ago
Factor completely 20x3y + 30x2y2.
Alexxandr [17]
<span>10x2y(2x + 3y)

Each term has 10 in it. Plus each term has at least 2 x's and 1y. The parenthesis are what's left over. </span>
8 0
3 years ago
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