A hot water tank holds 200L of water. When the tap is opened, the water drains at a rate of 15L/min.The amount of water left in the tank after t minutes is given by the A=200-15t.
a)How much water will be left in the tank after 5 minutes?10 minutes?
b) Solve the formula for t
c)How long to the nearest minute will it take to drain the tank?

Question

anonymous · Answer

for a), plug in the values for t. find A when t = 5 and t = 10.

for b), isolate t in the equation, the way that A is isolated in the original example

for c) find t when A = 0

shelby1290 · Answer

so for part a i'd have to do 200-15x5 and then 200-15x10 to find the answer?

shelby1290 · Answer

juts trying to clarify somethings

shelby1290 · Answer

and with part b i have to divide ? since it multiplies

shelby1290 · Answer

and with c find it when its just 0 ...but then what do i do with 0 
wouldnt the answer just be 0 for everything

anonymous · Answer

yes. 

at some point yes

and no, A = 0

means 0 = 200 - 15t --->  15t = 200

solve for t

(goinh to eat ill be back)

shelby1290 · Answer

oh so i have to find t 
lol np

shelby1290 · Answer

i'll show you my answers to make sure im correct so i might take a while as well

shelby1290 · Answer

|dw:1385686150165:dw|