Solve the equation and check your solution.-x = - 
A. x = 
B. x = - 
C. x = - 
D. x = 
Answer: A
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Compare the right-hand and left-hand derivatives to determine whether or not the function is differentiable at the point whose coordinates are given.
y = 
y = -1
A. Since limx?-1+ f '(x) = -1 while limx?-1- f '(x) = 0, f(x) is not differentiable at 
B. Since limx?-1+ f '(x) = 0 while limx?-1- f '(x) = 1, f(x) is not differentiable at 
C. Since limx?-1+ f '(x) = 0 while limx?-1- f '(x) = -1, f(x) is not differentiable at 
D. Since limx?-1+ f '(x) = 0 while limx?-1- f '(x) = 0, f(x) is differentiable at 
Solve the problem.A particular substance decays in such a way that it loses half its weight each day. How much of the substance is left after 10 days if it starts out at 128 grams?
A. 
g
B. 4 g
C. 
g
D. 8 g
Multiply or divide the fractions. Reduce to simplest form.
? 
A. 
B. 
C. 
D. 
Express the English phrase using an algebraic expression.70 subtracted from a number y
A. 70 - y B. y - 70 C. 70y D. 70