Because normally you don't cut posters into thirds. You keep them as whole numbers therefore fractions make no sense
Answer:
It is a equation
Step-by-step explanation:
Because it has an equal sign if it does not it will be a expression.
Y=mx+b
m=slope
b=yintercept
given
y=-2x+3 and
y=-4x-1
first equation is slope -2 and yintercept 3
second is slope -4 and yintercept -1
3rd option
Salt flows in at a rate of (5 g/L)*(3 L/min) = 15 g/min.
Salt flows out at a rate of (x/10 g/L)*(3 L/min) = 3x/10 g/min.
So the net flow rate of salt, given by 
in grams, is governed by the differential equation,
which is linear. Move the 
term to the right side, then multiply both sides by 
:
Integrate both sides, then solve for :
Since the tank starts with 5 g of salt at time 
, we have
The time it takes for the tank to hold 20 g of salt is 
such that
5 1/3 + 1 3/4(5 1/3) = 16/3 + 7/4(16/3) = 16/3 + 28/3 = 44/3 or 14 2/3 <==
