Your local gas stations are having a price war. During the past 7 days they have lowered the price of regular gas by $.02 each day. Define a variable. Then write and solve an equation to find the total change in gas price. Show your work.

Question

turingtest · Answer

P(t)=Rt 
where 
P=price change (in $) 
R=rate of change of price (in $/day)
t=time (in days)
t is the variable because it is the only thing that we imagine is changing
P(7)=0.02(7)=$0.14