I think it's 7 I don't think I have a direct answer why I think it's 7 but yeah I think it's 7.
Answer:
C. 5.556
hoped this helps!
Step-by-step explanation:
Because x,y,z form a geometric sequence, therefore the common ratio is
r = y/x = z/y
That is,
y² = xz (1)
We are given:
x + y + z = 18
Therefore
x + z = 18 - y (2)
Also,
x² + y² + z² = 612
Therefore, from (1), obtain
x² + z² + xz = 612
(x + z)² - xz = 612
From (1) and (2), obtain
(18 - y)² - y² = 612
324 - 36y + y² - y² = 612
-36y = 288
y = -8
Answer: y = -8
Answer:
20
Step-by-step explanation:
because f (20) would also be 20. Since we don't know the value behind 20, we would suppose x is the value. The original equation is now 
. If we do 
we would get that (since x is being substituted) 
.
Answer:
A
Step-by-step explanation:
