a rectangle has vertices a(2,6), b(2,9), C(7,9), and D(7,6), what is the length of each side of the rectangle?
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The number of bacteria in species A at time t is given by: 
.
The number of bacteria in species B at time t is given by
You are asked to find N(t) which is the difference in the species at time t. Difference refers to the answer is a subtraction problem. Thus, we are asked to find N(t) = A(t)-B(t)
We subtract and obtain:
That is,
which is the last answer choice.
With respect to notation, it is common to denote an exponent using ^. So if we want to write
we can write "(.25t)^3"
The number of bacteria in species B at time t is given by
You are asked to find N(t) which is the difference in the species at time t. Difference refers to the answer is a subtraction problem. Thus, we are asked to find N(t) = A(t)-B(t)
We subtract and obtain:
That is,
With respect to notation, it is common to denote an exponent using ^. So if we want to write