Aball is thrown upwards at a speed of 12 m/s. how long until it reaches its highest point?

The acceleration due to gravity on Earth is 9.8 m/s per second.
That means that an object out in the open gains 9.8 m/s of speed
downward, or loses 9.8 m/s of speed upward, every second.

The ball starts out with 12 m/s of speed upward.  It loses 9.8 m/s
of speed upward every second.  After  (12 / 9.8) = 1.22 seconds,
it has run out of upward speed, and begins moving downward.

She sold 135 peaches, because if you multiply 2.50 eith 135, you'd get 337.5, the 0 can be added or not.