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kozerog [31]
3 years ago
10

How is 89 a prime number

Mathematics
1 answer:
ad-work [718]3 years ago
4 0
Hello,

10*10=100>89
n=89 is prime if it not divisible by all prime less then its square root

0<89<100 ==>0<√89<10
The primes to test are 2,3,5,7.
89 does not end with a even digit ==> 89 is not divisible by 2
8+9=17 if not divisible by 3 ==>89 is not divisible by 3
89 does not end with 0 or 5 ==>89 is not divisible by 5

3*8+1*9=33 is not divisible by 7 ==>89 is not divisible by 7

So: 89 is prime.


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-3 -9 Which is the simplified form of (90-9 ot (90 °)?​
Marysya12 [62]

Answer:

I believe it is -3, althought -9 would work it needs to be simplified as low as possible and 3x3=9, therefore you can simplify 9 to 3.

Step-by-step explanation:

7 0
3 years ago
Kyra was at soccer practice. she blocked 55% of the goals that were kicked at her during a team drill. ashley scored two of the
Minchanka [31]

Total kicks that were attempted = 40

Goals blocked by Kyra = 55%;

Goals which could not be blocked by Kyra = 100 - 55 = 45%

Goals made during team drill = 18

Let total kicks attempted be 'n';

Therefore;

(18/n) × 100 % = 45 %

18/n = 45/100;

n = 1800/45;

n = 40

To learn more about this; visit: brainly.com/question/18522423

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7 0
2 years ago
Really need help on #15 please.
ollegr [7]

Step-by-step explanation:

Let's call L the length and W the width.  The length is 10 feet longer than the width, so:

L = W + 10

The area is the length times width, so:

119 = LW

Substituting:

119 = (W + 10) W

119 = W² + 10W

0 = W² + 10W − 119

0 = (W + 17) (W − 7)

W = -17 or 7

Since W must be positive, W = 7.

L = W + 10

L = 17

The length and width are 17 feet and 7 feet, respectively.

5 0
3 years ago
Kinda confused on what the sum would be?!? HELP NOWW PLEASE
valentinak56 [21]
That is b. aka 2
thanks
4 0
3 years ago
Please help me with this!!
rewona [7]
Area = b * h
Area of orange = area of big square subtract by area of small square

Small square = b^2
Big square = a^2
(a^2 - b^2) = (a - b)( a + b)

Solution: (a - b) (a + b)
8 0
2 years ago
Read 2 more answers
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