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
boyakko [2]
3 years ago
15

If x-y=9,x²+y²=27,then xy=?​

Mathematics
1 answer:
Tresset [83]3 years ago
5 0

Answer:

xy = - 27

Step-by-step explanation:

Note that

(x - y)² = x² - 2xy + y² ← substitute given values, that is

9² = 27 - 2xy

81 = 27 - 2xy ( subtract 27 from both sides )

54 = - 2xy (divide both sides by - 2 )

- 27 = xy

You might be interested in
Find the value of c so that the polynomial p(×) is divisible by (x-4). p(×)=cx^3-15x-68​
Dvinal [7]

Answer:

Step-by-step explanation:

x-4=0

x=4

p(x)=cx^3-15x-68=0

p(x)=c(4)^3-15(4)-68=0

p(x)=64c-60+68=0

p(x)=64c+8=0

p(x)=64c=-8

p(x)=c=-8/64

p(x)=c=-1/8

7 0
3 years ago
A car travels 2.83 km in the x-direction, then turns left 65.3 ◦ to the original direction and travels an additional distance of
umka21 [38]

Answer:

  4.24 km

Step-by-step explanation:

The x-component of the displacement after the turn is ...

  d2·cos(θ) = (3.38 km)cos(65.3°) ≈ 1.41239 km

Adding this to the displacement before the turn, we have ...

  x-component of displacement = 2.83 km + 1.41 km = 4.24 km

4 0
3 years ago
Enter the number 46.1979 rounded to the nearest hundredth (two decimal places)
muminat

Answer:

It should be 46.20

Step-by-step explanation:

You're rounding to the nearest hundredth. So you have 46.1979 to start out with. Then you count 2 places so you end at the 1st 9. Well, behind the 9 is a 7 so you round up and get 20

6 0
1 year ago
Using a rule why is = to 3 x + 4 find the value of y when x is 2
Alex73 [517]
X=2 so 2+4=6 so y=6. I just gone ovee this unit aswell.
4 0
4 years ago
Emily needs enough Fabric for 3 1/2 hats. Since she has half a hat done. If each bag requires 1 2/7 ft of Fabric, how much fabri
kow [346]

first off let's convert the mixed fractions to improper fractions.

\stackrel{mixed}{3\frac{1}{2}}\implies \cfrac{3\cdot 2+1}{2}\implies \stackrel{improper}{\cfrac{7}{2}} ~\hfill \stackrel{mixed}{1\frac{2}{7}}\implies \cfrac{1\cdot 7+2}{7}\implies \stackrel{improper}{\cfrac{9}{7}}

she already did half a hat, so we can say   \cfrac{7}{2}-\cfrac{1}{2}\implies \cfrac{7-1}{2}\implies 3

so she only needs enough fabric to make 3 more full hats, we know each one uses 9/7 ft, so

3\cdot \cfrac{9}{7}\implies \cfrac{27}{7}\implies 3\frac{6}{7}

5 0
2 years ago
Other questions:
  • Question 16a. Please help. ASAP
    11·2 answers
  • One three rolls of a single die, you will lose $14 if a 6 turns up at least once, and you will win $6 otherwise. What is the exp
    12·1 answer
  • 5. Which third-party wants little to no government interference?
    10·1 answer
  • A cube which measures 27 inches on one side
    13·1 answer
  • How many tiles will figure 13 have ?? <br> FREE POINTS!
    6·2 answers
  • Use compatible numbers to estimate the quotient.674.8 ÷ 23
    15·1 answer
  • Jackson mowed 5 yards and made $40.00. How much did he make for mowing 8 yards?
    6·1 answer
  • How many centimeters are equivalent<br> to 2.5 meters?
    11·2 answers
  • Suppose you work for a marketing consulting firm and you are tasked to determine the proportion of Americans who respond positiv
    5·1 answer
  • The linear equation y=mx+b contains the point (-5, 5) and is perpendicular to the line 5x+25y=11.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!