The expression -5t^2 + 20t+5 represents the height, in meters, of a baseball t seconds after it was hit into the field. the initial height of the baseball is

The initial height is found when t=0

-5t^2 + 20t+5

0 + 0 +5

the initial height is 5 meters

hello :

70y^8 + 30y^6 = 2 ( 35 y^8 + 15y^6)

the lenght is : 35 y^8

the width is : 15y^6

just sum

10 + 10 = 20