Answer : A 
Take square root for each term and simplify it
so we will get
Subtract 17 from both sides
9= -d+17
9 - 17 = -d + 17 - 17
-8 = -d
Then divide.
-8/1 = -d-1
Cancel terms that are in both numerator and denominator
Answer:
8 = d
Answer:
do the possible math functions first like 3 x 2 and 6 + 96
Answer:
B) -9
Step-by-step explanation:
31+2= 33 --> -33 + 49= --> 16
-5x-5= 25
16 -25 = -9
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
