Just use derivatives:
f'(x)= .48x-.96 = 0, x = 2, since the coeff of x^2 is +, this is a minimum
x=0 1989, so x = 2 is 1991! :)
Answer:


Step-by-step explanation:
The trigonometric function;
has zeroes at
where
is an odd integer.
The trigonometric function;
. This also has zeroes at
where
is an odd integer.
If you draw a simple diagram you can see that point to form a right angle ACB, C must be at (3,0).
Answer:
e
Step-by-step explanation:
Answer:
40
Step-by-step explanation: