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svp [43]
3 years ago
12

Determine whether the number is divisible by 3. Give a reason based on the tests for divisibility

Mathematics
1 answer:
hoa [83]3 years ago
8 0

Answer:

No

Step-by-step explanation:

A little trick to easily see if things are divisible by 3 is to add the 2 numbers together.

For example with 71 if you add 7+1 you get 8. 8 is not divisible by 3.

However if you were looking at 81 you add 8+1 to get 9. 3×3=9 so 81 is divisible by 3.

By putting that into a calculator you can see that 81/3=27 and 71/3=23.6666...

Hope that helped!

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son4ous [18]
The surface area of a cylinder is given by the equation 2πrexponet2 +2πrh, where r is the radius of the cylinder and h is the height of the cylinder. What is the surface area of a cylinder with the radius x-1 and height 2x?

5 0
3 years ago
Factorise completely<br>x²-7x=12​
Rashid [163]

Answer:

undefined

Step-by-step explanation:

x²-7x=12

we make the equation equal to zero by subtracting 12 from both sides, we have..

x²-7x-12 = 12-12

x²-7x-12= 0

we find the factors of 12 such that when we multiply them we will get -12 and when we add them we will get -7, and those factors are but those values are not possible..

so answer = undefined

6 0
2 years ago
Gertrude started an experiment with 15 gummy bears. After 6 days, there were 1,523 gummy bears. Write an exponential function th
Lunna [17]

9514 1404 393

Answer:

  y = 15·2.1599^x

Step-by-step explanation:

We know that the number changed by the ratio 1523/15 = 101.5333... in 6 days, so the daily multiplier is the 6th root of this:

  b = 101.5333...^(1/6) = 2.1599 . . . rounded to 4 dp

Of course, the coefficient 'a' in the equation is the initial number, 15.

Your exponential equation is ...

  y = 15·2.1599^x

  a = 15

  b = 2.1599

5 0
3 years ago
What is the factor tree for 16 and <br> 20
mrs_skeptik [129]
20: 1,24,5,20

16: 1,2,16
6 0
2 years ago
The greatest comen factor of 21, 30,49
liq [111]
The greatest common factor for 21 is 7
For 30 is 15
49 is 7

I’m no totally sure but i think that is right
4 0
2 years ago
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