Notice the picture below
so.. whatever the parabola y= -3x²+k is, will pass over (3,-2) and (-3,-2)
so.. .let us pick say hmmm 3,-2
thus

solve for "k"
Answer:
Domain: 
Range: 
Step-by-step explanation:
Given

Required
Determine the domain and the range
Solving for domain:
From the question, we understand that t represent years.
Because years can't be negative;
Then, we can conclude that the domain, t is:

Solving for Range:
We solved domain to be 
This implies that the minimum value of t is
and the maximum is infinity
Substitute 0 for t in 



Hence;
The range is 
Answer:
2n.2p.3r
Step-by-step explanation:
idk
Step-by-step explanation:
no 2
if wrong correct me pls
Answer:
7.5kilometer
Step-by-step explanation:
for 30mins semin runs 5kilometer
then for 1min: (1min×5kilometer)÷30mins,
therefore, for 45mins: (45mins×5kilometer)÷30mins=7.5kilometer