Answer:
757
Step-by-step explanation:
im not very sure,, hope.it helped :)
(1x+2y+3z)/(x+y+z)=1.5
x+2y+3z=1.5x+1.5y+1.5z
0.5y+1.5z=0.5x
x=y+3z
The answer would be -9 + -4
Answer:

Step-by-step explanation:
Given


Required
Evaluate Blue when z = 9
To do this, we simply substitute 9 for z in 

Convert indices to fraction


<em>Hence, the blue section has an area of </em>
<em></em>
Answer:
1287
Step-by-step explanation:
Number of people in elevator , n = 8
Number of floors, r = 6
Since they all look alike, arrangement doesn't matter, the we use combination :
(n+r-1 r - 1) = (8+6-1 C 6-1) = 13C5
Recall:
nCr = n! / (n-r)!r!
13C5 = 13! / (13-5)!5!
13C5 = 13*12*11*10*9 / 5*4*3*2*1
= 1287