The associative property allows you to change the <em>grouping</em> of addends or factors without changing the value of the expression.
Step-by-step explanation:
I have used substitution method here to find the value of x and y.
What is the context for the question if there is any?
Answer:
y=25600
y=100(2)^{2t}
y=252
Step-by-step explanation:
A bacteria culture starts with 100 bacteria and doubles in size every half hour.

where x represents the number of hours
(a) t= 4 hours
Plug in 4 for t and find out the number of bacteria y

25600 bacteria

convert 40 seconds into hour
40 divide by 60 =2/3

The graph is attached below