15. Two mark exercise problems - VIII

1. A ball rolls down a slope and travels a distance \(d = t^2 - 0.75t\) feet in \(t\) seconds. Find the time when the distance travelled by the ball is \(11.25\) feet.

 

Answer:

 

The time taken by the ball \(=\)  seconds.

 

2. If the difference between a number and its reciprocal is \(\frac{24}{5}\), find the number.

 

Answer:

 

The numbers are  and $\frac{i}{i}$.

 

(Note: Insert negative sign whenever necessary.)