Solve the proportion and check. 
= 
A. 18
B. 18
C. 18
D. 18
Answer: C
Mathematics
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Use an Euler diagram to determine whether the argument is valid or invalid.All students who study get better grades.Roger is a student who studies. Therefore, Roger will get better grades.
A. valid B. invalid
Mathematics
Simplify the complex fractions.
A. - 
B. - 
C. - 
D. - 
Mathematics
Find the slope of the line.y = 
x + 
A. m = 
B. m = 
C. m = - 
D. m = 3
Mathematics
Solve the problem.Find the area A and circumference C of a circle of radius 9 cm. Express the answer in terms of ?.
A. A = 324? cm2; C = 9? cm B. A = 18? cm2; C = 18? cm C. A = 36? cm2; C = 9? cm D. A = 81? cm2; C = 18? cm
Mathematics