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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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A triangle's height is 10 feet more than its base. If the area of the triangle is 100 square feet, use factoring to find its dim
stiks02 [169]

The base length of the triangle is 10 ft. and the height of the triangle is 20ft.

Step-by-step explanation:

Height = base + 10

Area = 100 square ft

Area of a triangle= (1/2) (b) (h)

100 = (1/2) (b) (b + 10)

200 = b(b) + 10b

b(b) + 10b - 200 = 0

b(b) + 20b - 10b - 200 = 0

b ( b + 20) -10(b + 20) = 0

(b-10) (b+20) =0

b = 10 (or) b = -20

Here b is the length and cannot be negative.

So, b = 10ft

h = b + 10

h = 10 + 10

h = 20 ft.

The base length of the triangle is 10 ft. and the height of the triangle is 20ft.

6 0
3 years ago
Solve for y in terms of x<br> 3(x – 7) + 7y = 10x
MAXImum [283]

Answer:

solve for y is y = x + 3

Solve for x is x = − 3 + y

Step-by-step explanation:

4 0
3 years ago
What are 1<br> ways to make 98
Anna35 [415]
90 + 8 ? What are you asking? :)
7 0
3 years ago
Completely Factor the expression -18 P - 9​
jekas [21]

can i have brainliest pls tyyy :)))

Answer:

-9(2p+1)

Step-by-step explanation:

-18p - 9

find the GCF (greatest common factor) for the expression.

-9

then, divide each term by the GCF

-18p / -9        -9 / -9

= 2p               = 1

next, put the two terms you get when dividing into the final form of the answer:

GCF on the outside and quotients on the inside

-9(2p+1)

hope this helped! ;)

5 0
3 years ago
Can you pls tell me the answer to it
zlopas [31]
top middle, square, and right triangle. to find perimeter you simply add all of the side lengths :)
4 0
3 years ago
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