40% u just add the 2 decimals together
5+2x10=25. This is because you would start with multiplication, 2x10=20, then, add 5, so 20+5=25.
For question 11, you essentially need to find when h(t) = 0, since that is when the height of the ball reaches 0 (ie touches the ground).
For question 12, it is asking for a maximum height, so you need to find when dh/dt = 0 and taking the second derivative to prove that there is maximum at t. That will find you the time at which the ball will hit a maximum height.
Rinse and repeat question 12 for question 13
The answer is 20 because 3 is closer t 1 than 10
