Indicate whether the equation illustrates the additive identity, commutative property of addition, associative property of addition, or additive inverse.5 + 7 = 7 + 5
A. Additive identity
B. Associative property of addition
C. Commutative property of addition
D. Additive inverse
Answer: C
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Parametrize the surface S.S is the portion of the sphere x2 + y2 + z2 = 64 between z = - 4
and z = 4
.
What will be an ideal response?
Solve the problem.The quadratic function 
models the median, or average, age, y, at which U.S. men were first married x years after 1900. In which year was this average age at a minimum? (Round to the nearest year.) What was the average age at first marriage for that year? (Round to the nearest tenth.)
A. 1952, 36 years old B. 1936, 49.2 years old C. 1958, 24.2 years old D. 1958, 49.2 years old
To improve reading skills, elementary school children read silently at the end of the school day for 
of an hour on Mondays and for 
of an hour on Fridays. For the month of January, how many hours did the children read silently in class? Use the calendar for help.
?
SMTWTFS12345678910111213141516171819202122232425262728293031?
?
A. 
hours
B. 
hours
C. 
hours
D. 
hours
E. 
hours
Perform the indicated operation.(30x8 - 50x5 + 100x2) ÷ (-10x2)
A. -3x6 - 50x5 + 100x2 B. 30x6 - 50x3 + 100 C. -3x8 + 5x5 - 10x2 D. -3x6 + 5x3 - 10