Answer:

33 gallons of water to begin with.
Step-by-step explanation:
So we essentially are given two coordinates: (6,87) and (21,222). To find an equation, we simply need to find the slope and y-intercept. We know it's a linear equation because it's a steady stream, meaning a constant slope.
The slope is:

So, the rate at which the stream flows is 9 gallons per minute.
Now, let's find the initial amount of water. To do this, we can use point-slope form. Pick either of the two points. I'm going to use (6,87).

So, there were 33 gallons of water in the tank to begin with.
Answer:
c = 5 and t = 20
Step-by-step explanation:
t = 2c + 10, t = 4c
so
2c + 10 = 4c
-2c = -10
c = 5
t = 4(5)
t = 20
Answer:
78000000
Step-by-step explanation:
(7.8 x 10^3) (1.0 x 10^4) =?
Change 6% into its decimal form which is 0.06 then multiply it by 500.
500*0.06= 30
30 is the 6% of 500