Answer
d=14
Work Step by Step
$\frac{2}{7}=\frac{4}{d}$ cross multiply
$2d=7\times4$ divide both sides by 2
$2d\div2=28\div2$ simplify
$d=14$
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 2 - Solving Equations - 2-7 Solving Proportions - Practice and Problem-Solving Exercises - Page 127: 21
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