Solve the problem.The decay of 230 mg of an isotope is given by A(t)= 230e-0.032t, where t is time in years. Find the amount left after 69 years.
A. 13 mg
B. 25 mg
C. 223 mg
D. 24 mg
Answer: B
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Write the inequality in interval notation.
A. (4, ?) B. (-?, ?] C. (-?, 4) D. (-?, -5]
Change the improper fraction to a mixed number or a whole number.
A. 16
B. 15
C. 
D. 17
Find the vertices and locate the foci for the hyperbola whose equation is given.16x2 - 25y2 = 400
A. vertices: (-4, 0), (4, 0)
foci: (-
, 0), (
, 0)
B. vertices: (-5, 0), (5, 0)
foci: (-3, 0), (3, 0)
C. vertices: (0, -5), (0, 5)
foci: (0, -
), (0, 
)
D. vertices: (-5, 0), (5, 0)
foci: (-
, 0), (
, 0)
Solve the problem.In a student survey, 97 students indicated that they speak Spanish, 30 students indicated that they speak French, 8 students indicated that they speak both Spanish and French, and 124 students indicated that they speak neither. How many students participated in the survey?
A. 243 B. 251 C. 119 D. 235