Solve.logx81 = 2
A. x = 
B. x = -9
C. x = 9
D. x = -2
Answer: C
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Provide an appropriate response.A student argued that it is impossible to use the substitution method to determine if a system of equations has no solution or an infinite number of solutions. Is the student correct?
Fill in the blank(s) with the appropriate word(s).
Complete the identity.cos (? + ?) cos (? - ?) = ?
A. sin2 ? - sin2 ? B. cos2 ? + sin2 ? C. cos2 ? - sin2 ? D. cos2 ? - sin2 ?
Mix a solution that is 70% alcohol with a solution that is 10% alcohol to make 240 mL of a solution that is 20% alcohol. How much of each solution should you use?
A. So, mix 120 mL of the 70% solution and 120 mL of the 10% solution. B. So, mix 30 mL of the 70% solution and 210 mL of the 10% solution. C. So, mix 40 mL of the 70% solution and 200 mL of the 10% solution. D. So, mix 210 mL of the 70% solution and 30 mL of the 10% solution. E. So, mix 200 mL of the 70% solution and 40 mL of the 10% solution.
Use the properties of limits to help decide whether the limit exists. If the limit exists, find its value.
A. 
B. - 
C. 0
D. Does not exist