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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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Wich exprecion shows 7+21 written as a product of two factors
Aleks [24]

Answer:

7(1+3)

Step-by-step explanation:

5 0
3 years ago
Solve the equation q(q+4) = 0<br><br> A) (0,-4)<br> B) (0,4)<br> C) (0)<br> D) (1,-4)
Marta_Voda [28]

Answer:

A) (0,-4)

Step-by-step explanation:

q(q+4) = 0

q = 0 or q + 4 = 0

q = 0 or q = - 4

3 0
3 years ago
Solve by factorising<br> x^{2} + 8x + 15 = 0
AVprozaik [17]
(x+5) (x+3)

x^2 = (x+?) (x+?)
8x+15= 5&3
8x= 5•3
15= 5+3
8 0
3 years ago
Read 2 more answers
In the equation 0.5x - 8 = 1.5 the decimal coefficient is what
geniusboy [140]

We know that coefficient of an equation is the number multiplied by variable.

-8 and 1.5 are the constants for our given equation.

The variable of our given equation is x. We can also see that x is being multiplied by 0.5, therefore, 0.5 would be the decimal coefficient of our given equation.

4 0
3 years ago
The formula for the volume of a sphere is V space equals space 4 over 3 Ïr cubed. Find the radius to the nearest hundredth of a
rjkz [21]

Answer:

r = 1.68 ft

Step-by-step explanation:

Volume of a sphere, V = 4/3πr³

V = 20 ft³

π = 3.14

r = ?

V = 4/3πr³

20 = 4/3 × 3.14 × r³

20 = (4×3.14×r³)/3

Cross product

20 × 3 = 4 × 3.14 × r³

60 = 12.56r³

r³ = 60/12.56

= 4.7771

r = 3√4.7771

= 1.6842

Approximately

r = 1.68 ft to the nearest hundredth

4 0
3 years ago
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