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sertanlavr [38]
3 years ago
12

If 315 = 21 what does 420 =??

Mathematics
1 answer:
Elden [556K]3 years ago
3 0

Answer:

28

Step-by-step explanation:

315/15 = 21

420/15 = 28

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If the spin rate of the CD is 580 rpm what distance is traveled by the piece of dust (in radians) in 2.9 mins
natta225 [31]

Answer:

d=10568.76rads

Step-by-step explanation:

From the question we are told that:

Angular Velocity \omega=580rpm=>60.74rads/sec

Time t=2.9mins=>174sec

Generally the equation for distance d is mathematically given by

 d=\omega*t

 d=60.74*174

 d=10568.76rads

7 0
3 years ago
While driving your rental car on your trip to Europe, you find that you are getting 12.4 kilometers per liter of gasoline. What
11Alexandr11 [23.1K]
<span>One kilometer is equal to 0.621371 miles. Conversely, one mile is equal to 1.609344 kilometers. One liter is equal to 0.264172 gallons, and one gallon is equal to 3.78541103373138 liters. Thus, 12.4 kilometers per liter is equal to 29.16661 miles per gallon as 1 km/l = 2.352145833 mpg.</span>
7 0
3 years ago
Martin had 7 pounds of grapes left, and he gave away 2 5 of them. Explain how to use compatible numbers to estimate the amount o
nalin [4]

Compatible numbers are numbers which are easy to do mental calculation. For example is when doing division like 25 and 5, 100 and 10, and 36 and 6.

First, we know that: 7 pounds=5 pounds + 2 pounds

                                or 7=5+2

In mathematics, the word “of” means to multiply. So:

                                grapes given away = 7  * (2/5)

Replacing 7 with 5 and 2:

                                                                = (5+2)*(2/5)

Using the distribution principle:

                                                =5*(2/5) + 2*(2/5)

                                                =2+ 4/5

                                =2 4/5

So grapes given away is 2 4/5 pounds.

3 0
4 years ago
Read 2 more answers
Heyy Answer please and explain
ludmilkaskok [199]

Answer: V=37.5 cm³

Step-by-step explanation:

Formula

V=(πr²h)/3

Given

r=5/2=2.5 cm

h=6 cm

Solve

V=(πr²h)/3

V=(π(2.5)²(6))/3

V=(π(6.25)(6))/3

V=37.5π/3

V=37.5(3)/3

V=37.5 cm³

Hope this helps!! :)

Please let me know if you have any questions

5 0
3 years ago
7 over 8 plus 4 over nine
Natasha2012 [34]
(7/8) + (4/9) = 1.3194
6 0
3 years ago
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