Answer:
its 30 inches
Step-by-step explanation:
all you had to do was all 4 thihngs add sutact nd muptly
75. As she is going up, 15 stairs have been passed by the escalator moving. When she goes down same thing
Write a system of equations:
x + y = 125
20x + 15y = 2100
Solving:
x = 125 - y
20(125 - y) + 15y = 2100
2500 - 20y + 15y = 2100
2500 - 5y = 2100
-5y = 2100 - 2500
-5y = -400
y=80
x + 80 = 125
x = 125 - 80
x = 45
The first charges 45$ per hour and the second charges 80$ per hour
For
, we have
So for
to be continuous at
, we require that the limit as
is equal to 4.
