There were many names mentioned in this section. Give a brief description for the person named in problem, telling how they were related to the development of computers.
?
Aristophanes
?
A. 1st computer in the 1800s
B. Bill Gates' partner in Microsoft
C. finger counting
D. 19th century calculating machine
E. 1st computer in the 1990s
Answer: C
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Subtract the fractions below, and express the answer in its lowest terms.
?
?
A.
B.
C.
D.
E.
none of these
Find the square root correct to the thousandths place.
A. 0.333 B. 0.167 C. 0.577 D. 1.155
Translate to a system of two equations, then solve.Two angles are complementary. The second angle measures 76° less than the first angle. What is the measure of the first angle?
A. 173° B. 83° C. 104° D. 17°
Find the standard deviation of the data summarized in the given frequency table.The test scores of 40 students are summarized in the frequency table below. Find the standard deviation. 
A. 12.2 B. 12.8 C. 14.2 D. 13.5