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
inn [45]
2 years ago
9

A girl's age in 12 years' time is the square of her present age. Find her present age.

Mathematics
2 answers:
SIZIF [17.4K]2 years ago
4 0

Answer:

  4

Step-by-step explanation:

Let x represent her present age. The given relation is ...

  x +12 = x^2

Putting this in standard form, we can factor it:

  x^2 -x -12 = 0

  (x -4)(x +3) = 0

Solutions to this quadratic are x = 4, x = -3. The -3 solution is extraneous in this context.

The girl's present age is 4.

harkovskaia [24]2 years ago
3 0

Answer: her present age is 4

Step-by-step explanation:

Proof: 4+12=16

Square root 4 is 16

You might be interested in
Prove: Every point of S=(0, 1) is an interior point of S.
myrzilka [38]

Answer:

Proved

Step-by-step explanation:

To prove that every point in the open interval (0,1) is an interior point of S

This we can prove by contradiction method.

Let, if possible c be a point in the interval which is not an interior point.

Then c has a neighbourhood which contains atleast one point not in (0,1)

Let d be the point which is in neighbourhood of c but not in S(0,1)

Then the points between c and d would be either in (0,1) or not in (0,1)

If out of all points say d1,d2..... we find that dn is a point which is in (0,1) and dn+1 is not in (0,1) however large n is.

Then we find that dn is a boundary point of S

But since S is an open interval there is no boundary point hence we get a contradiction. Our assumption was wrong.

Every point of S=(0, 1) is an interior point of S.

3 0
2 years ago
A Pairs socks that normally sells for eight dollars is on sale for 15% off find the sale price of the socks then find the total
Lena [83]

Answer:

Step-by-step explanation:

The original selling price of the pair of socks is $8. The pair of socks is on sale for 15%. The new selling price of the pair of socks would be the original price - 15% off the original price. It becomes

8 - (15/100 × 8) = 8 - 0.15×8 = 8 - 1.2 = $6.8

if the sales tax rate is 8%, it means that the total cost of the socks would be the new selling price + 8% of the new selling price. It becomes

Total cost of the pair of socks

= 6.8 + (8/100×6.8) = 6.8 + 0.08×6.8 = 6.8 + 0.544 = $7.344

7 0
2 years ago
Shirts are on sale 20% off! The original price of the shirt was $28.50. How
loris [4]

Answer: im not sure

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Which is the factored form of 3y − 18?
Lesechka [4]
3y-18
Pull out 3 (common factor):
3(y-6)

A) 3(y-6) is the correct answer
6 0
3 years ago
Read 2 more answers
100 is divisible by which of the following numbers 2,3,4,5,6,9 or 10?
pochemuha
The correct answer is B: 2,4,5, 10

We know that 100 is not divisible by 3 because 100/3 is 33.33 repeating, which is an irrational number.

We also know that 100 is not divisible by 6 because 100/6 is 16.66 repeating which is also an irrational number.

100/2=50 (rational)
100/4=25 (rational)
100/5=20 (rational)
100/10=20 (rational)

Hope this helps!
6 0
3 years ago
Other questions:
  • Please help me my life depends on it
    15·1 answer
  • A number divided by five is at least four
    9·2 answers
  • You need exactly 47 bottles of water. You don’t want to buy more than you need, but you want the least expensive way. List the b
    6·1 answer
  • Let f (x)=X2 -x. if (x)=132, then what is the value of x?
    11·1 answer
  • Can some one please help me with this problem
    15·1 answer
  • What kind of #are real numbers?
    5·2 answers
  • How many parallel lines does a regular pentagon have?
    11·1 answer
  • On July 1, Black Corporation had 200,000 shares of $10 par common stock outstanding. The market price of the stock was $12 per s
    5·1 answer
  • Plssssss help I need the answer
    14·1 answer
  • Help please. Will give brainlist
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!