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
ICE Princess25 [194]
3 years ago
8

Find a and b such that gcd(a, b) = 14, a > 2000, b > 2000, and the only prime divisors of a and b are 2 and 7.

Mathematics
1 answer:
choli [55]3 years ago
8 0

Answer:

a = 2^\alpha.14 \ ,\alpha\geq 8\\b = 7^\delta.14 \ , \delta\geq 3

Step-by-step explanation:

As 2  and 7 are the only prime divisors of both a and b we know that both can be written as:

a = 2^\alpha . 7^\beta \ , \alpha ,\beta\ \in \mathbb{N}_{0}\\b = 2^\gamma . 7^\delta \ , \gamma ,\delta\ \in \mathbb{N}_{0}\\

Where \mathbb{N}_{0} is the set of all natural numbers adding the zero (careful because this part is important as I'll explain next).

We also know that 14 divides both numbers and that is actually the greatest common divisor between them. So we can rewrite a and b as follows:

a = 2^\alpha . 7^\beta.14 \ , \alpha ,\beta\ \in \mathbb{N}_{0}\\b = 2^\gamma . 7^\delta.14 \ , \gamma ,\delta\ \in \mathbb{N}_{0}\\

Why do I write them like this? Because this way is easier to observe that if \alpha and \gamma were both greater than zero, then 28 would divide both hence 14 wouldn't be their g.c.d.. Likewise, if \beta and \delta were both greater than zero, then 98 would divide both and once again, 14 wouldn't be their g.c.d.

So either of them has to be equal to zero. And then we have that

a = 2^\alpha.14 \\b = 7^\delta.14

All we have left to do is find the possible values for \alpha and \delta so that a>2000 \ , b>2000 and that only happens if \alpha\geq 8 and \delta\geq 3

You might be interested in
Consider the function p(t) shown, state the intervals on which the function is increasing.
satela [25.4K]

Answer:

its A

Step-by-step explanation:

because A is a reasonable explanation

5 0
3 years ago
Read 2 more answers
Since a math school opened the girls basketball team had the same record every season the team won a total of 182 games while lo
Tems11 [23]

Answer:

11

Step-by-step explanation:

I guess

6 0
3 years ago
aleta's puppy gained 3/8 pounds each week for 4 weeks. altogether, how much weight did the puppy gained
Arturiano [62]
1 1/2 pounds is how much her puppy gained altogether
8 0
3 years ago
$750 are deposited into an account quarterly for eight yeara at an interest rate of 7.9% compounded quarterly how much is in the
IgorC [24]
750*7.9%*8=474 is the account at the end of 8 years. Good luck
4 0
3 years ago
Solve: 1/7x + 3/4=9/8
kherson [118]
<span><span>x=<span>​<span>21</span><span>​​/8

</span></span></span><span>Decimal Form: 2.625
</span>Hope that helped!!</span>
8 0
3 years ago
Other questions:
  • A physics class has 40 students. Of​ these, 16 students are physics majors and 14 students are female. Of the physics​ majors, f
    15·1 answer
  • Rearrange the formula d = m/v for v
    14·2 answers
  • A car sales man sales 5 cars this month. Each car cost about $34,000. If he
    15·1 answer
  • Orange M&amp;M’s: The M&amp;M’s web site says that 20% of milk chocolate M&amp;M’s are orange. Let’s assume this is true and set
    10·1 answer
  • Boba cost $4.00 and left a tip. The total was $4.36. What % did you tip?
    10·2 answers
  • Need help with this one
    8·1 answer
  • -2x - 7 = 3 need the answer
    14·1 answer
  • Solve for x (3X -8) (x+2)
    9·1 answer
  • What is the reason for statement 7 in the given proof?
    15·1 answer
  • Let U={1,2,3,4,5,6,7,8}A={2,3,6}B={2,4,5,7}C={1,7,8}Find the following use the roster method to write method to write the set. E
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!