Solve by the substitution method. x + 6y = 367x + 7y = 42
A. (0, 6)
B. (1, 5)
C. (36, 42)
D. (-6, 0)
Answer: A
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Suppose that the functions f and g and their derivatives with respect to x have the following values at the given values of x. Find the derivative with respect to x of the given combination at the given value of x.
1/g2(x), x = 4
A. - 
B. 
C. 
D. - 
Solve the problem.Consider a retirement savings account where the monthly contribution is $100 for the first 15 years, is increased to $225 for the next 15 years, and then is increased once again to $325 for the last 10 years. The APR is always 5.4% compounded monthly. What is the value of the account at the end of 40 years? Round your answer to the nearest cent.
A. $257,880.02 B. $255,975.42 C. $266,356.93 D. $281,406.16 E. $264,452.33
Simplify.
+ 
A. 
B. 
C. 
D. 
Write the solution set in interval notation.{x|x > -4}
A. (-?, -4) B. (-?, -4] C. [-4, ?) D. (-4, ?)