Determine whether the polygons are similar. If so find the scale factor written as a ratio

Yes; 1:1.2

Step-by-step explanation:

To find if the polygons are similar we must see if all sides are multiplied by the same amount. 30/25=1.2 42/35=1.2 24/20=1.2. This proves the polygons are similar by SSS. The scale factor is how much you multiply the values by to get the other values. To write it as a ratio you start with this, 1:x. x is how much you multiply it by. In other words, 20*x=24. Simple algebra gives us 1.2. The scale factor as a ratio is 1:1.2

21

step-by-step explanation:

they charge the same amount at 20 minutes.

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