Answer:
1.75
Explanation:
Since the triangles are similar, the ratios of the sides are similar
p e
----- = ------------
t a
Using cross products
p *a = t*e
Substituting what we know
3.5 * (2.125) = 4.25 e
Divide each side by 4.25
7.4375/4.25 = 4.25e/4.25
1.75 =e