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
Monica [59]
3 years ago
5

Prove it disprove: if 2n + 4 is even then n is even.

Mathematics
1 answer:
svetoff [14.1K]3 years ago
8 0

The first claim,

"If 2<em>n</em> + 4 is even, then <em>n</em> is even"

is false; as a counterexample, consider <em>n</em> = 1, which is odd, yet 2•1 + 4 = 6 is even.

The second claim,

"If <em>n</em> is even, then (<em>n</em> + 3)² is odd"

is true. This is because

(<em>n</em> + 3)² = <em>n</em> ² + 6<em>n</em> + 9

<em>n</em> ² + 6<em>n</em> is even because <em>n</em> is even. 9 is odd. The sum of an even and odd integer is odd.

You might be interested in
(PHOTO) PLEASE HELPPP I HAVE NO CLUE
emmainna [20.7K]

Answer:

so what grades work

Step-by-step explanation:

someone help in the comments

srry i need pts

7 0
3 years ago
Most of the geometry concepts and theorems that are learned in high school today were first discovered and proved by mathematici
sweet-ann [11.9K]

Answer:

self realization, confidence

Step-by-step explanation:

also these concepts are used in real life jobs but most people think otherwise because you dont use them in a grocery store... yeah people think that, but also its so these concepts that were figured out thousands of years ago dont fade away with the newer generations

8 0
3 years ago
bob needs to be at school by 7:00 it takes him 1 hour and 21 minutes to get there. his morning routine takes 30 minutes. what ti
Maslowich
He should leave at 6:39
4 0
3 years ago
Find the length of AC. Express your answer in terms of pi. <br> Answer options: 5, 30, 45, 15.
Nitella [24]

Answer:

The correct answer is 3πcm

Step-by-step explanation:

The length of an arc is calculated using the formula P=∅/360×2πr

where ∅is the angle the arc subtends at the center of the circle, and r is the radius of the circle of which the arc is part.

2r gives the diameter which from the diagram corresponds to AB=36 cm

therefore P=30/360×π×36

=3πcm

6 0
3 years ago
Read 2 more answers
What is 5/15 + 5? I have to write 20 charecters so idk what else to say.
djverab [1.8K]

Answer:

\frac{16}{3}

Step-by-step explanation:

\frac{5}{15} + 5

\frac{1}{3} + 5

\frac{1}{3} + \frac{15}{3}

\frac{1+15}{3}

\frac{16}{3}

5 0
3 years ago
Read 2 more answers
Other questions:
  • What is the surface area of sphere with a radius of 7?
    10·2 answers
  • A car moves at a speed that allows it to move 45 yards in 5⁄4 of a second. How long will it take a car at the same speed to move
    7·1 answer
  • A researcher is interested in knowing the average height of the men in a village. To the researcher, the population of interest
    10·1 answer
  • 1. the figure below is a parallelogram which statement must be true
    7·1 answer
  • What does - |15/-3| equal ?
    7·1 answer
  • State whether the following mapping represents a function. Then give the domain and range.
    6·1 answer
  • In which quadrant is point C?
    11·1 answer
  • Guys help me with this question please. Due Now
    12·1 answer
  • Which of the following expressions is equivalent to (6x-2) (3x+3)?
    5·1 answer
  • Determine the point where the lines x=4t+1,y=t-9,z=2t+1 and x=5s+1, y= -s, z= 5s -9 intersect.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!