Decide if the given value of x is a critical number for f, and if so, decide whether the point is a relative minimum, relative maximum, or neither.f(x) = (x + 7)4; x = -7
A. Critical number; relative maximum at (-7, 0)
B. Critical number; relative minimum at (-7, 0)
C. Critical number but not an extreme point
D. Not a critical number
Answer: B
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Find the indicated limit or state that it does not exist.
A. 1 B. ? C. -1 D. 0
Translate the phrase; then simplify.Find the sum of 
and 
.
A. 47 B. 43 C. -47 D. -43
Iodine-131 is an isotope that is used to study the functioning of the thyroid gland. This isotope has a half-life (time required for half the material to erode) of approximately 6 days. If a patient is given an injection that contains 13 micrograms of iodine-131, what will be the iodine level in the patient after 8 days? Use the function 
, where A is the amount of the isotope, in micrograms, in the patient after t days. Round to the nearest tenth.
a. 3.9 micrograms b. 5.2 micrograms c. 6.0 micrograms d. 6.8 micrograms e. 7.6 micrograms
Answer the question.Two cars leave an intersection. One car travels north; the other east. When the car traveling north had gone 18 mi, the distance between the cars was 6 mi more than the distance traveled by the car heading east. If the eastbound car traveled x miles, what is the distance between the cars in terms of x?
A. 6x B. x - 6 C. 6 - x D. x + 6