Sentence:  To determine car speed for a given combination of engine speed , gear ratio , and tire size , the formula is : * * f For an engine speed of 5000 rpm , a gear ratio of 4.00 to 1 , and a tire radius of 13 inches , the equation would look like this : * * f To determine engine speed for a given combination of the other three factors the formula is : * * f Using the same figures as for the previous example , the equation <WSD>becomes</WSD> : * * 
Meaning of the word marked with <WSD> tags:  undergo a change or development