Kangaroo rat is found in:

If $A$ and $B$ are any two events,then $P(A \cup B) = $

$A$ car starts from rest and moves with uniform acceleration $a$ on a straight road from time $t = 0$ to $t = T$. After that,a constant deceleration brings it to rest. In this process,the average speed of the car is

Alzheimer's disease in humans is associated with the deficiency of:

The coordinates of the focus of the parabola described parametrically by $x = 5t^2 + 2, y = 10t + 4$ are

(in $, cm$)