at 3:45 siri was going up an elevator from the 2nd floor. At 3:48 she arrived on the 42 floor. What was the average time per floor?

Question

at 3:45 siri was going up an elevator from the 2nd floor.  At 3:48 she arrived on the 42 floor.  What was the average time per floor?

anonymous · Answer

can i get any help each problem i put on here. i never receive an answer

jim_thompson5910 · Answer

She changes 42 - 2 = 40 floors in 48-45 = 3 minutes 


So divide that 3 minutes (or 60*3 = 180 seconds) up into 40 equal chunks to get 


180/40 = 4.5 


So she spends 4.5 seconds on each floor

anonymous · Answer

at 3am a measurement was taken to be 50 miles. At 6am the same measurement was 35 miles. What is that average rateof change per hour?  How many total hours go by before the distance register 0 miles?

jim_thompson5910 · Answer

You lose 50-35 = 15 miles for every 6-3 = 3 hours

So the rate of change is 15/3 = 5 hours and this rate of change is negative (to show that you're losing miles as time goes on)

jim_thompson5910 · Answer

oops I meant to write that the rate of change is  -5 miles/hr  (basically you lose 5 miles every hour)

anonymous · Answer

is there 2 answers to that q or the only answer is 5 miles/hr

jim_thompson5910 · Answer

Well you use that first part to answer the second part

jim_thompson5910 · Answer

Since you know that you lose 5 mi per hr, this means that you lose 5x miles in x hrs


So 50 - 5x = 0  ----> x = 10

Which means that in 10 hours, the distance will be 0

anonymous · Answer

determine if the foolfollowing are parallel, perpendicular, or neither   (a) y=5x+6
                                                                                                                y=-5x+6

anonymous · Answer

i meant following

jim_thompson5910 · Answer

What are the slopes of each line?

anonymous · Answer

do not know how to do this at all. do i have to get the slope first

jim_thompson5910 · Answer

yes, do you know how to find the slope?

anonymous · Answer

no

jim_thompson5910 · Answer

The slope is simply the number in front of the x term

jim_thompson5910 · Answer

Since the equation is in y = mx+b form

anonymous · Answer

the  5 is in front of the x for the first one, how do i determine if its perpendicular, parallel or neither

jim_thompson5910 · Answer

So the slope of y = 5x+6 is 5

The slope of y = -5x+6 is -5


Since these two slopes are NOT equal, this means the two lines are NOT parallel.

jim_thompson5910 · Answer

Also, -5 is not the negative reciprocal of 5. So the two lines are NOT perpendicular.

anonymous · Answer

the following is the same q. y=x+4, y=-x-3..........y=1/2x+8,y=2x...........y=7x-2,y=-1/7x+8............y=4,y=-3