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padilas [110]
3 years ago
13

How to determine whether a number is prime or composite number without using calculator fast?

Mathematics
1 answer:
Assoli18 [71]3 years ago
3 0

Answer:

To prove whether a number is a prime number, first try dividing it by 2, and see if you get a whole number. If you do, it can't be a prime number. If you don't get a whole number, next try dividing it by prime numbers: 3, 5, 7, 11 (9 is divisible by 3) and so on, always dividing by a prime number

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[50 Points (must answer in detail)] Imogene's car traveled 660 mi averaging a certain speed. If the car had gone 6 mph faster, t
Doss [256]

Answer:

55 mph

Step-by-step explanation:

Speed = Distance/Time so Time = Distance / Speed.

If the first speed is x mph, the first trip will take 660/x hours.

The second trip will take 660/(x+5) hours.

We want to find x such that (660/x) - 660/(x+5) = 1 (i.e. solving this equation for x).

Multiply both sides by x*(x+5):

660*(x+5) - 660x = x*(x+5)

660x + 3300 - 660x = x2 + 5x

x2 + 5x - 3300 = 0

(x - 55)*(x + 60) = 0

So either x = 55 or x = -60. Since x > 0, x = 55mph.

5 0
3 years ago
Jack earns 100$ on the first day, 60$ on the second day, 150$ on the third day, 80$ on the fourth day and 90$ on the fifth day.
madam [21]
To solve this you would add up all the money then divide it by the number of days the guy worked


100+60+150+80+90= 480

480÷5= 96

Jacks average earnings was 96 dollars per day
6 0
4 years ago
Read 2 more answers
What values of b satisfy 4(3b + 2)2 = 64?
Vikentia [17]
Given the equation 4(3b + 2)² = 64, dividing both sides of the equation by 4, we have (3b + 2)² = 16 and getting the square root of both sides, (3b + 2) = 4 and (3b + 2) = -4 We can solve for b for each equation and have 3b = 2 | 3b = -6 b = 2/3 | b = -2 Therefore, the values of b are 2/3 and -2 and from the choices, the answer is <span>A: b = 2/3 and b = -2.</span>
8 0
3 years ago
What is 448 28% of?<br> Then, what is 24% of that number?
JulsSmile [24]
I believe this is right

Move the decimal over two places so so it becomes .28
Then divide 448 by .28
Which is equaled to 1600
Move the decimal over two places so 24% becomes .24
Then multiply .24 by 1600
And the answer is 384

(Might be wrong sorry)
5 0
3 years ago
In order to qualify for a role in a play, an actor must be taller than 64 inches but shorter than 68 inches. The inequality 64 &
iren [92.7K]

Answer:

Option A is correct.

Step-by-step explanation:

64 < x < 68

This inequality represent that the height x should be greater than 64 and less than 68.i.e.

x>64 and x<68

So, Option A is correct.

8 0
4 years ago
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