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
True [87]
3 years ago
9

Bethany, Lauren, Amanda, and David all meet at a family reunion. They are comparing their ages. They have found that Lauren is 1

3 years older than Bethany and David is 11 years older than Amanda. They also found that the product of Bethany's and Lauren's ages is equal to twice Amanda's age. Also, if they subtract 20 years from both Bethany's and Lauren's age, the product is equal to David's age.
If x represents Bethany's age and y represents Amanda's age, then which of the following systems of equations can be used to determine the ages of all four family members based on their findings?

Mathematics
2 answers:
tekilochka [14]3 years ago
6 0
Lauren =l
David=d
Bethany's =x
Amanda =y
l=x+13
d=y+11
lx=2y
<span>(x+13)x=2y
</span>2y=x^2+13x
y= \frac{1}{2}(x^2+13x)
or
y= \frac{x^2}{2}+ \frac{13}{2}x
(x-20)(l-20)=d
<span>(x-20)(x+13-20)=y+11 </span><span>
</span>y+11=(x-20)(x-7)
y+11=x^2-27x+140
y=x^2-27x+129
so I believe its b
Hope this helps :)
Natali5045456 [20]3 years ago
3 0

its D for plato users

You might be interested in
Find the volume of each figure. Round to the nearest tenth if necessary.​
RideAnS [48]

Answer:

396

Step-by-step explanation:

the volume of a rectangular is calculated as V=l×w×h

l=11, w=12, h=3

V=11×12×3

V= 396

3 0
2 years ago
Please help ASAP!!!Explain how to solve the problem if u can
lord [1]

Answer:

60

Step-by-step explanation:

x²=36×(64+36)

x=√3600

x=60

5 0
3 years ago
Need helpwith this math
solniwko [45]

Answer: -0.6, -1/4 (-0.25), -0.15

Step-by-step explanation: the farther away from 0, going left, the smaller the number.

7 0
2 years ago
Pls Some Help me Asap Hot ta Get this done in 1st per
Kazeer [188]

    Ok, use the sum of triangle theorm all angles of the triangle has a sum of 180 degrees. B is 90 degrees because it labeled it self ABC the A angle seems by the degree to be at the top of the triangle and there needs to be a 90 degree angle in a right triangle. Now if you add 90 + 28 you get 118 degrees subtract that from the sum of all the angles ( 180 degrees), and get 62 degrees as angle C.  Angle A is 28 degrees, angle B is 90 degrees, angle C is 62 degrees.  

5 0
2 years ago
1.) 2x + y = 3 2.) x - 2y = -1 If equation 1 is multiplied by 2 and then the equations are added, the result is
Alexus [3.1K]
3×2=6
6+(-1)=6-1=5
The answer is 5
5 0
3 years ago
Other questions:
  • I want to know what the answer is in a fraction.
    13·1 answer
  • a boat cost 92,000.00 and depreciates in value by 15% per year how much will the boat be worth after 10 years
    15·2 answers
  • A miner has 3 kilograms of gold dust. She needs to share it evenly with four partners. How much gold should each of the five peo
    5·2 answers
  • 1) The table shows the cost for one year of college. Suppose you have $6,000 in grants and scholarships to attend your first yea
    10·2 answers
  • A credit card company is about to send out a mailing to test the market for a new credit card. From that sample, they want to es
    8·2 answers
  • I need help with this, Take all my points if u can help me thank you sm dude
    13·2 answers
  • Only answer if you actually know the answer and know what your doing. thx:)
    11·1 answer
  • Given the diagram below, what is mD?
    11·2 answers
  • Using partial quotients, which would be the best choice for the first number to subtract in the division problem 5,166 divided b
    12·1 answer
  • What is the probability of pulling a blue marble AND THEN a red marble from a bag of 6 blue, 2 red, and 4 purple marbles?
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!