## Algebra 1

$y=28$ cm
area = 1960 $A = .5*h(b_{1}+b_{2})$ $1960 = .5*y*(y+4y)$ $1960 = .5y*5y$ $1960*2 = .5y*5y*2$ $3920 = 5y^2$ $3920/5 = 5y^2/5$ $784 = y^2$ $\sqrt {784} = \sqrt {y^2}$ $y = 28$