Two math

use the quadratic formula to solve the equation. (first picture)

find all the zeroes of the equation. (second picture)

x=7±√17/2

Step-by-step explanation:

-b±√b²-4ac/2a

-(-7)±√7²-4×1×8/2

=7±√49-32/2

x=7±√17/2

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m

there are no answer choices

step-by-step explanation: