WHT ARE THE EASIEST WAYS TO FIGURE OUT IF A NUMBER IS PRIME OF COMPOSITE

2 answers:

4 0

To find out if a number is prime you have to find it's factors. if the factors are only 1 and that number it's prime, if the number has other factors then it's composite. hope i helped! have a great day.

Varvara68 [4.7K]3 years ago

3 0

I usually start with 2 and go up the prime numbers until I get to the square root of the number and IF I haven't fond a factor by then, then I will say it is prime.

Example factors of 381
square root is roughly 19.5
Now I will see if the numbers 2, 3, 5, 7, 11, 13, 17, or 19 will go into it. If any of them do then the number is composite, if not then it is prime.

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The number of horses occupying stalls at the county fairgrounds can be modeled by the following function, where x represents the

Elenna [48]

Answer:
_______________________________________________________
The rewritten equation is:

" - 3x² + 30 + 225 = 0 " ;

which is ultimately simplified to:

" x² − 10 − 75 = 0 " .
___________________________________________________
The number of days is: "15 days" .
___________________________________________________<span>

Explanation:
______________________________________________
Given:

h(x) = - 3x</span>² <span>+ 30 + 225 ;

Rewrite as: " </span>- 3x² + 30 + 225 = 0 " ;
__________________________________________________________
Multiply EACH SIDE of the equation by "-1" ; to get rid of the "-3" ;

-1 * {- 3x² + 30 + 225 = 0} ;

to get: " 3x² − 30 <span>− 225 = 0" ;

Divide EACH SIDE of the equation by "3" ; to simplify; since:

"3", "30", and "225" are divisible by "3" ;

{</span>3x² − 30 − 225} / 3 = 0 / 3 ;

to get:
______________________________________
" x² − 10 − 75 = 0 " ;

______________________________________
Let us factor:

-15 + 5 = -10 ;

-15 * 5 = -75 ;
_______________________________________
Rewrite as:

(x − 15) (x + 5) = 0 ;

x = 15; and x = -5 ;
_______________________________________
The number of days cannot be "negative value"; so we stick with:

"x = 15 days"
___________________________________________________
Answer: The rewritten equation is:

" - 3x² + 30 + 225 = 0 " ;

which is ultimately simplified to:

" x² − 10 − 75 = 0 " .
___________________________________________________
The number of days is: "15 days" .
___________________________________________________

6 0

4 years ago

Vivian is getting a pet snake. She is choosing between the ball python and the corn snake. the ball python is 4 1/2 ft long and

Nadusha1986 [10]

Answer:

The 45 in snake is the shorter one.

Step-by-step explanation:

Which is shorter, 45 in or 4 1/2 ft?

12 in

Convert 4 1/2 ft into inches by multiplying 4 1/2 ft by --------- = 54 in.

1 ft

Thus, the 45 in snake is shorter than the 54 in one and should b e V's first choice.

8 0

4 years ago

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sleet_krkn [62]

C. is equal to 3/8 they both equal .375

7 0

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trapecia [35]

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5 0

3 years ago

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Stells [14]

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