Your starting place on a track is 30 centimeters. What is your new position if you move 10 centimeters to the left of this position?

1 Answer
Anthony R.
Dec 26, 2017

#20"cm"#

Explanation:

We can visualize a number line where we are at a position of #30# #"cm"# where moving to the right is forward and positive and the left is backwards and negative.

So, if we move #10# #"cm"# to the left, we are walking backwards and thus, in terms of a number line, we subtract this distance from our starting point.

Thus, #30# #"cm"# #-10# #"cm"=20# #"cm"#

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