1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
pshichka [43]
3 years ago
8

Prime numbers are closed under subtraction

Mathematics
1 answer:
Alona [7]3 years ago
6 0

This is false. If we assumed the prime numbers were closed under subtraction, then the difference of any two primes would also get us a prime number.

Take the prime numbers 11 and 7. Their difference, 11 - 7, is 4, but 4 is composite, as it has 2 as a factor other than 1 and 4. All we need is this one counterexample to prove that prime numbers are <em>not </em>closed under subtraction.

You might be interested in
2х + 6 = 7x - 14<br> What’s the answer?
Radda [10]

Answer:

x = 4

Step-by-step explanation:

2x + 6 = 7x - 14

2x - 7x = - 14 - 6

-5x = -20

x = 4

5 0
3 years ago
Read 2 more answers
What is the y-intercept of the line given by the equation below? y = 8x 7
iren [92.7K]
If the point is a y-intercept the x value would be zero. 8 is the slope, 7 is the y-intercept y=mx+b (0,7)
5 0
3 years ago
Read 2 more answers
It cost $44.88 to buy 12 gallons of gas.What was the cost per gallon of gas?
Natali [406]

Answer:

$3.74 per gallon

Step-by-step explanation:

1. Divide $44.88 by 12

2. The answer will be 3.74

3. Each gallon will cost $3.74

4 0
4 years ago
A hotel charges an intial check-in fee of 30$, plus 40$ for each day the room is booked. How many days must the room be booked f
pochemuha
Thats impossible. it will be at least 30 dollars. but one night is 40 dollars
3 0
3 years ago
If 20% of X =y, then y% of 20 is the same as:​
coldgirl [10]

Answer:

4% of x

Step-by-step explanation:

20% of x

  • 20% of x = 0.2x
  • 20% of x = y ⇒ 0.2x = y

y% of 20

  • y% of 20 = 20*y/100 = 0.2y
  • 0.2y = 0.2*0.2x = 0.04x
  • y% of 20 = 4% of x

Hope it is what you are looking for

8 0
3 years ago
Other questions:
  • Please show working for these 2 questions.
    13·1 answer
  • Please someone help me??
    8·2 answers
  • Millie went shopping and took £60 to spend. she spent 1/2 of her money on a pair of shoes, she then spent 2/3 of what she had le
    9·1 answer
  • Find the quadratic equation for y=x^2+6x-7
    11·1 answer
  • it took a toy car 1 minute to roll 180 ft. what was this cars average rate of speed, in ft per second?
    15·1 answer
  • What does 12^2 equal
    7·1 answer
  • Write a numerical expression Add 91, 129, and 16, and then divide<br> by 44. hurry i need help
    14·1 answer
  • First-person to get this right with an explanation gets Brainliest
    13·2 answers
  • I need some help finding the volume of a sphere with a diameter of 18.6cm. The website says the answer I got from my calculator
    10·1 answer
  • Find the third quartile from the given data: 50,40,55,60,61,70,49​
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!