Answer:5400
Step-by-step explanation:9•6= 54
Add both zeros from 900 at the end and it’s 5400
Pictures listed in order... from A-C
step 1
find the equation of the line
where
x-------> numbers of light bulbs
y-------> the total cost in $
let
A (0,0) B (10,18)
slope m=18/10-----> m=1.8
step 2
with m=1.8 and the point A (0,0)
y-y1=m*(x-x1)------> y=1.8x
step 3
for x=1
y=1.8*1------> y=$1.8
therefore
the answer is
the cost of a single light bulb is $1.8
The 2 is in the tenths place so it is two-tenths.
Two-tenths = 2/10= .2
I hope that answers your question.