Answer
$y=28$ cm
Work Step by Step
area = 1960
$A = .5*h(b_{1}+b_{2})$
$1960 = .5*y*(y+4y)$
$1960 = .5y*5y$
$1960*2 = .5y*5y*2$
$3920 = 5y^2$
$3920/5 = 5y^2/5$
$784 = y^2$
$\sqrt {784} = \sqrt {y^2}$
$ y = 28$
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 9 - Quadratic Functions and Equations - 9-3 Solving Quadratic Equations - Practice and Problem-Solving Exercises - Page 553: 57
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