Answer:
See verification below
Step-by-step explanation:
We can differentiate P(t) respect to t with usual rules (quotient, exponential, and sum) and rearrange the result. First, note that

Now, differentiate to obtain


To obtain the required form, extract a factor in both the numerator and denominator:

Answer:
Lisa is 23 years old.
Step-by-step explanation:
36 (total) - 13 (brothers age) = 23 (Lisa's age)
23+13=36
Answer:
y = −
4
Step-by-step explanation: