Answer:
45, 36
Step-by-step explanation:
let x y minutes be the time for pipes to fill the tank, let n be the water needed to fill the tank.
x-y=9
(n/x)*20+(n/y)*20=n
n is removed by dividing the 2nd equation by n
here u get:
(1/x+1/y)*20=1
you sub x=9+y into the above equation
1/y+1/(9+y)=1/20
((9+y)+(y))*20=(9+y)(y)
180+40y=9y+y2
y2-31y-180=0
then use the quadratic formula and u will find y=36 or -5
-5 is rejected because it is negative
x=36+9=45
therefore it is 36 mins and 45 mins
Answer:
xnone=
Step-by-step explanation:
5X+3x-15=6x+2x-15
8x-15=8x+15
-15=15
Answer:
4 units count the boxes from a to b and that's 4
Answer:
C. 7
49 square rooted would be 7 and the 4 in (x+4) would be negative and not positive like the answer shows.
Answer:
0.4
Step-by-step explanation:
