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
b. 5.2 micrograms
Mathematics
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Solve the problem. Use 3.14 for ?. Round your answer to the nearest hundredth.Glenda wants to glue glitter over a piece of felt shaped like a parallelogram with a height of 32 in. and a base of 54 in. If the glitter costs $0.90 per ft2, how much will it cost to cover the felt?
A. $1555.2 B. $43.20 C. $10.80 D. $129.60
Mathematics
Convert as indicated.3.31 kg to grams
A. 0.0331 g B. 331 g C. 0.00331 g D. 3310 g
Mathematics
Graph one complete cycle of 
. Label the axes accurately.
?
A. ?
B. ?
C. ?
D. ?
E. ?
Mathematics
Find the value of the unique real number ? between 0 and 2? that satisfies the given conditions.cos ? = - 
and tan ? < 0
A. 
B. 
C. 
D. 
Mathematics