The worlds fastest passenger elevator operates at an average speed of about 10 m/s. If the 60th floor is 219 meters above the 1st floor, how much time does it take the elevator to go from the first floor to the 60th? show work

It takes 21.9 s to get to the 60th floor.

Step-by-step explanation:

Given

V= 10m/s

time =?

Δ distance = 219m

Speed = distance traveled/time interval

v= Δd/t

by isolating time we have

t = Δd/v plug in given

t = 219m/(10m/s )

t = 21.9 s

It takes 21.9 s to get to the 60th floor.

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

correct choice is b

step-by-step explanation:

when you calculate the average rate of change of a function, you are finding the slope of the secant line between the two points. for the function the average rate of change from point to point can be calculated as

to find the average rate of change from day 2 to day 10, note that at day 2, 8 houses were sold, so a(2,8) and at day 10, 2 houses were sold, so b(10,2). thus,