## anonymous one year ago Help Needed: Eduardo’s average speed on his commute to work was 55 miles per hour. On the way home, he hit traffic and only averaged 40 miles per hour. If the round trip took him 1.25 hours, which expression represents the distance, in miles, for his trip home that is missing from the table? (Will give medal)

1. anonymous

2. anonymous

To see the problem better, see the attachment.

3. UsukiDoll

given - 55 mph to commute to work 40 mph to commute to home a round trip is 1.25 hours

4. UsukiDoll

so what happened to the speed? @Roman532

5. anonymous

Why it decreased?

6. UsukiDoll

yes it decreased due to traffic... is the math symbol for decrease + or -?

7. anonymous

- ?

8. UsukiDoll

yes because decrease means going down.. decrease in speed means going slow

9. UsukiDoll

the formula is distance = rate x time

10. UsukiDoll

we are given that the rate to commute to home is is 40 distance =40 x ?

11. anonymous

So I'm guessing that narrows it to C or D?

12. UsukiDoll

yeah... I'm thinking that the variable for time goes first what happened to the time? If it took 1.25 and speed went down from 55 mph to 40 mph...

13. anonymous

He hit traffic... And I'm guessing the answer is D?

14. UsukiDoll

we are given that a round trip took 1.25 hours and the speed decreased from 55 mph to 40 mph.

15. anonymous

Now that I look at it...

16. UsukiDoll

so our time has to be t-1.25 because he hit traffic and his speed decreased

17. UsukiDoll

distance = rate x time distance = 40 (t-1.25)

18. UsukiDoll

the reason why it's not the first two choices is that it neglected the rate

19. anonymous

Right because it has to be rate x time

20. UsukiDoll

mhm :)

21. UsukiDoll

not sure if order matters.. I'm assuming the variable goes first.. it's been over a decade since I've done those problems and I end up just guessing when I first did them... but I read it through carefully finding out what's given and what do I need to translate in math terms

22. anonymous

yeah I'm having a hard time deciding whether it's C or D

23. UsukiDoll

do you have unlimited tries?

24. anonymous

I get 3 tries, 2 left. It's a quiz I must pass. I'm going with C because it makes sense to x 40 and 1.25 and then subtract the hours

25. UsukiDoll

these problems don't surface at all in higher level Math lol. I think these problems are meant to torture young students.

26. anonymous

Haha I just hate Algebra and Calculus, I'm not going to be some rocket scientist when older so I really do not need it, basically pointless. Busy work.

27. UsukiDoll

:S I'm looking at similar examples... the variable does go first.

28. anonymous

Should I change my answer? I chose C

29. UsukiDoll

did you submit it?

30. anonymous

Not yet just keeping note of this problem for the next quiz re-take

31. anonymous

@UsukiDoll

32. UsukiDoll

yes?

33. anonymous

Nevermind actually, I'll leave my answer as C

34. anonymous

Thanks for the help