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Cerrena [4.2K]
3 years ago
12

How can u tell if a number is divisible by 3?

Mathematics
1 answer:
vagabundo [1.1K]3 years ago
3 0
To check for divisibility by 3 just check if the sum of all the digits in the number are divisible by 3. If so, the number itself must also be divisible by 3. For example, is 1,529 divisible by 3? Well, the sum of the digits of 1,529 is 1+5+2+9=17. Since 17 is not divisible by 3, we can conclude that 1,529 is also not divisible by 3. How about 1,530? Well, this time the sum is 1+5+3+0=9. Since 9 is divisible by 3, we know that 1,530 is divisible by 3 too.
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This is something about absolute value but i have no idea how to do it
Advocard [28]

You're looking for an inequality of the form |t-b|\le a, or -a\le t-b\le a, or b-a\le t\le b+a.

Start with

350^\circ\le t\le400^\circ

Notice that 375º is the midpoint of this interval of temperatures. If we subtract all sides by 375º, then we get

-25^\circ\le t-375^\circ\le25^\circ

so we can set a=25^\circ and b=375^\circ, and we can rewrite this inequality in terms of absolute values as

|t-375^\circ|\le25^\circ

3 0
4 years ago
Really need help figuring this out
Margarita [4]

Answer: x=18, R=20 degrees,

sin Q=3/5

cos Q=4/5

tan Q=3/4

sec Q=5/4

csc Q=5/3

cot Q=4/3

Step-by-step explanation:

Distance formula: a^2+b^2=c^2

30^2=24^2+x^2

900=576+x^2

x^2=324

x=18

180=P+Q+R

180=90+70+R

180=160+R

R=20 degrees

sin Q=18/30=3/5

cos Q=24/30=4/5

tan Q=18/24=3/4

sec Q=30/24=5/4

csc Q=30/18=5/3

cot Q=24/18=4/3

6 0
1 year ago
Hiiooo! Could someone please help me❤️❤️❤️I really need it❤️Much love:)<br><br> -Boopy
yKpoI14uk [10]

<u>Answer:</u>

Since the trianges are similar

then:

  • E = J = 90°
  • F = L = 65°
  • G = K = 180-90-65 = 25°
7 0
3 years ago
How many times greater is the value 8 in 856 than the value of the 8 in 8.56
erik [133]

Answer:

the value is 100 times greater

Step-by-step explanation:

look at my comment below

8 0
3 years ago
Read 2 more answers
PLEASE HELP!!!!!!!3. An apartment complex has 20 apartments. The number of bedrooms is represented in the box-and-whisker plot a
Inessa05 [86]
Lowest value is 0
Lower quartile is 2.2
Median is 3
Upper quartile is 4.7
Highest value is 6

8 0
4 years ago
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