Find the limit by direct substitution.
?
?
A. 
= 7
B. 
= 9
C. 
= 84
D. 
= 
E. 
= 81
Answer: B
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Express the vector as a product of its length and direction.4i - 
j - 6k
A. 
B. 
C. 
(i - j - k)
D. 
Multiply in the indicated base.
A. 1222four B. 122four C. 1202four D. 1220four
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. ? Roger will get better grades.
A. Valid B. Invalid
Provide an appropriate response. Write the statement as an equation and solve:Tracy Edwards' back yard is a rectangle whose length is two times the width. If the perimeter of the yard is 120 feet, what is the width of the yard?
A. 120 = 2(2x + x); width is 40 feet B. 120 = 2(2x + x); width is 20 feet C. 120 = 2x + x; width is 40 feet D. 120 = 2x + x; width is 80 feet