Determine whether the line integral 
is positive, negative or zero.
A. positive
B. negative
C. zero
Answer: A
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Provide an appropriate response.A student wishes to take the integral over all real numbers of f(x) = 
, if x < 0 
, if x > 0 and claims this is zero because -? + ? equals zero. What is wrong with this thinking?
What will be an ideal response?
Simplify the exponential expression.x7 ? x-2
A. - 
B. 
C. -x5
D. x5
Solve by the substitution method.x + 2y = -5-7x + 3y = 35
A. {(5, -1)} B. {(x, y)|x + 2y = -5} C. {(-5, 0)} D. ?
Write the algebraic expression described.To convert from meters to centimeters, we multiply by 100. For example, the number of centimeters in 3 meters is 
If one piece of string has a length of 
meters, and another piece of string has a length of 
centimeters, express their total length in centimeters as an algebraic expression.
A. (801x + 193) cm B. (900x - 500) cm C. (9x - 5) cm D. (108x - 698) cm