Portion under square root sign:
= (b^2 - 4*a*c).
Mutually exclusive events that can not occur at the same time.
For example, throw a coin and get heads and tails at the same time.
It is impossible for this to happen and therefore, the probability of obtaining this result is zero.
In the same way that a and b occur at the same time, if both are mutually exclusive, it is impossible.
Therefore, the probability P (a and b) = 0
Answer:
I think it either 19 or 17
Step-by-step explanation:
B
Do 450 x 2/5 (0.4 in decimal form)
At ground level, the height is = 0. Therefore, s(t) = 0.
0 = -16t2 + 48t + 64
Divide both sides by -16.
0 = -16 (t2 - 3t - 4)
We are left with this equation: 0 = t2 - 3t - 4
Factor out.
0 = (t - 4) (t+1)
We solve each separately.
0 = (t-4)
t = 4
0 = (t+1)
t = -1
We are left with two answers but time cannot be negative so t = 4 seconds.