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3 years ago

How to find average.

Mathematics

2 answers:

larisa [96]3 years ago

6 0

Add up all of the numbers and then divide by the amount of numbers you have, basically the sum divided by the amount. :)

Ray Of Light [21]3 years ago

3 0

Answer:

Add up all the numbers then divided by how many numbers there is and the you'll get your answer.

Example:

70+80+75+85+90=400

400 divided by 5=80

So 80 is my answer

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The earth is 4,540,000,000 years old.

Ann [662]

Answer:10^8

Step-by-step explanation:

8 0

3 years ago

Is there a proportional relationship? A salt water solution for and aquarium calls for 35 parts of salt to 1000 parts of water t

morpeh [17]

Answer:

Yes

Step-by-step explanation:

To check proportionality :

35 α 1000

35 = 1000k

k = constant of proportionality ;

Divide both sides by 1000 to obtain k

35 / 1000 = 1000k / 1000

0.035 = k

For the ratio Given :

Ratio of 7 parts of salt and 200 parts of water

7 : 200

7 / 200

= 0.035

Since,

k = 0.035 ; 7 / 200 = 0.035

Hence, a proportional relationship exists.

7 0

3 years ago

Find the length of l on the curve r(t)=5cos(3t)i-5sin(3t)j+3tk over the interval [3,7]

stealth61 [152]

$\mathbf r(t)=5\cos3t\,\mathbf i-5\sin3t\,\mathbf j+3t\,\mathbf k$
$\mathrm d\mathbf r(t)=\mathbf r'(t)\,\mathrm dt=(-15\sin3t\,\mathbf i-15\cos3t\,\mathbf j+3\,\mathbf k)\,\mathrm dt$

$\displaystyle\int_C\mathrm d\mathbf r(t)=\int_{t=3}^{t=7}\|\mathbf r'(t)\,\mathrm dt\|=\int_{t=3}^{t=7}\sqrt{225\sin^23t+225\cos^23t+9}\,\mathrm dt$
$=\displaystyle3\sqrt{26}\int_{t=3}^{t=7}\mathrm dt$
$=12\sqrt{26}$

4 0

3 years ago

Find the radius of a cylinder that has a height of 20 and a volume of 7599.

Delicious77 [7]

The radius is 11. I did 7599 divied by 3.14 =2,420. 2,420 divied by 20 and got 121. then i squared that to get 11

6 0

3 years ago

Help I’m to lazy to do it

AleksandrR [38]

Bro use school cheats

4 0

3 years ago