00:01
This question is saying that figure a is a scale image of figure b.
00:07
And we have one side that for figure a is 30, and we have x.
00:12
We're going to write it up a proportion to find x, and then the 30 side goes with the 25 side on figure b, and then the 10.
00:23
So to solve this, we're going to cross -multiplify.
00:26
So we have a proportion, so we're going to solve it by cross -multifying and solving.
00:29
So 30 times 10 is 300 equals that we're going to do 25 times x, which is 25x.
00:37
Next step i'm going to do, divide both sides by 25, and i'm going to do 300 divided by 25, and i get 12.
00:49
Now, just to make sure, i'm going to do 300 over 20, 300 over 12 has to be the same as 25 over 10.
00:58
So let's simplify...