Use natural logarithms to solve the exponential equation symbolically.4(6 - 2x) = 16
A. x = - 3 + 
B. x = 3 - 
C. x = - 
- 6
D. x = 
+ 6
Answer: B
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Write in exponential form.log77-9 = -9
A. 9-7 = 9-7 B. 7-9 = 7-9 C. 7-9 = 9-7 D. 7-9 = log79
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
Solve.3x(x - 2) = 7x2 - 7x
A. x = 0, x = 
B. x = 0, x = 4
C. x = - 
, x = 0
D. x = 0
Solve the problem.A square piece of cardboard is to be formed into an open-topped box by cutting 
squares from the corners and folding up the sides. The volume of the resulting box is given by the formula V = 3(x - 6)2, where x is the original length of each side of the piece of cardboard. What is the volume of the box if the original length of each side of the piece of cardboard is 16 inches?
A. 30 in.3 B. 100 in.3 C. 768 in.3 D. 300 in.3