18 is the right answer. The two fractions must be porportional
identity used is
x³ + y³+ z³– 3xyz = (x + y + z) (x² + y² + z² – xy – yz – zx).
then use
(x+y+z)² = x²+y²+z²+2(xy+yz+xz)
225= 83 + 2(xy+yz+xz)
xy+yz+xz = (225-83)/2
xy+yz+xz= 142/2
xy+yz+xz= 71
ok
now use identity
x³ + y³+ z³– 3xyz = (x + y + z) (x² + y² + z² – xy – yz – zx).
now
x³ + y³+ z³– 3xyz = 15 (83 – xy – yz – zx).
= 15[83 - (71)]
= 15×12
=180
Median of 10, 55, 34, 21
First we arrange number in ascending or descending
10, 21, 34, 55 in ascending.
Median is the middle number and this is between 21 and 34.
We find the average:
(21 + 34) /2 = 55/2 = 27.5
Median is 27.5.
Answer:
Step-by-step explanation:Step 1: Use quadratic formula with a=1, b=-2, c=-2.
x=
−b±√b2−4ac
2a
x=
−(−2)±√(−2)2−4(1)(−2)
2(1)
x=
2±√12
2
x=1+√3 or x=1−√3
Answer:
x=1+√3 or x=1−√3
3/4 of 9 circle = 27/4 = 6 3/4 of the circle.
