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guajiro [1.7K]
3 years ago
13

a large balloon in the shape of a sphere is being filled with helium. The balloon has a radius of 1 foot. Helium costs $0.80 per

cubic foot. What is the cost of filling the balloon with helium?
Mathematics
1 answer:
zhenek [66]3 years ago
4 0

Answer:

$3.35

Step-by-step explanation:

volume of balloon in the shape of sphere= 4/3 * pi * r^3 = 4.189 cubic foot

cost of 1 cubic foot of helium = 0.8

cost of 1 * 4.189 cubic foot of helium = 0.8 * 4.189 = 3.35

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Expression that is equivalent to 27e+24
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2 years ago
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18. Which is more, five-eighths of a dollar or four-ninths of a dollar?
wel

Answer:

five-eighths of a dollar is more than four-ninths of a dollar

Step-by-step explanation:

If you convert the fractions into decimals:

5/8 = 0.625

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Hope that helped!

4 0
2 years ago
MAY DAY MAY DAY, HELP
Pavlova-9 [17]

Have you heard the expressions "shooting fish in a barrel" or
"taking candy from a baby" ?

I've decided to take your points and try not to feel guilty about it.

A).  That's it !  That's the equation, for ANY basketball on Earth. 
You wrote it right there in your question.

In that equation that you wrote, the ' r ' is the initial velocity. 
You said that Adam tossed it straight up, and it was going 10 meters per second
   when it left his hand. 
So ' r ' in the equation is +10.
The equation is:
                             <em>d = 10t - 5t²  </em>  .
It tells you how high the ball is above its tossing height after any number of seconds.
The ' t ' in the equation is the number of seconds.  Any letter could have been used,
but ' t ' was cleverly selected because it stands for 'time'.

B).  You want to know where it is after 0.5 second ?    All you have to do is put '0.5'
into the equation wherever there's a ' t '.  Do you really need somebody to do that
for you ?

Well, OK.  You're being so overly generous with your points . . .

         Distance = 10 t - 5 t²

         Distance = 10 (0.5) - 5 (0.5)²

         Distance =     5       - 5(0.25)

         Distance =     5       -  1.25

         <em>Distance =        3.75 meters </em>

                                <u>positive</u> 3.75 means <u>above</u> Adam's hand. 

A thinking exercise:
-- He tossed the ball upwards at  10  meters per second.
-- Why is it not  5  meters above his hands after  0.5  second?


7 0
3 years ago
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