Wednesday

July 30, 2014

July 30, 2014

Posted by **Shawn11** on Wednesday, August 1, 2007 at 3:02pm.

Distance = rate x time

let the time by helicopter be x hrs, then the time he drove would be 3-x hrs

Distance in helicopter = 60x

distance driven = 30(3-x)

so 60x + 30(3-x) = 150

solve for x, then sub into 60x

tell me what you got, I got 120

An instructor asked his/her class to evaluate the expression 1/2x for x = 5. Some students gave 0.1 for an answer while others gave 2.5. Which answer is correct?

Note: I cam eup with 0.15?

The way you wrote it as 1/2x, one has to follow the order of operation and it would be 1÷2*x which is then 1÷2*5 = 2.5

to obtain .1 you would have written it as

1/(2x)

I don't see how you could obtain .15 as an answer.

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