What is the answer -2(v+5)-(-1+v)=21
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The word you're looking for is "differentiate", not "derive".
Write the scale of the drawing as a fraction. Put the shorter length in the numerator.
First convert the denominator to the same units as the numerator. Write an equivalent fraction with centimeters in the denominator. Since 1 meter is equal to 100 centimeters, multiply the denominator by 100 to get centimeters in the denominator.
Write the scale factor as a ratio, using a colon
7/100 → 7:100
The scale factor is 7:100.
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