Question

if the scale factor is 4, what is the measurement of slide length x? 1.25 20 21

Explanation:

Step1: Recall scale - factor formula

The formula for scale - factor is $\text{Scale Factor}=\frac{\text{Length in new figure}}{\text{Length in original figure}}$. We know the scale factor is 4 and the length in the new figure is 28. Let the original length be $x$. So, $4=\frac{28}{x}$.

Step2: Solve for $x$

Cross - multiply to get $4x = 28$. Then divide both sides by 4: $x=\frac{28}{4}=7$.

Answer:

7