Write the phrase as an algebraic expression. Let x represent the unknown number.four plus the product of twelve and some number
A. -12 + 4x
B. -4 - 12 ÷ x
C. 4 + 12x
D. -4x + 12
Answer: C
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Find the second-order partial derivatives of the given function. Show that the mixed partial derivatives fxy and fyx are equal.
?
?
A. 
B. 
C. 
D. 
Determine whether or not the function is one-to-one.f(x) = 4x2 + x
A. No B. Yes
Perform the indicated operation.5 g × 7.7
A. 38.5 g B. 385 g C. 12.7 g D. 3850 g
Solve the problem.The value of a certain make and model of used car can depend on several factors. The table gives data for the values of three Chevy Caprice station wagons. The value V is measured in dollars, where A is the age of the car in years, and C is the condition of the car rated on a scale of 1 to 10 (10 is excellent condition). src="https://sciemce.com/media/4/ppg__file0518192205__f1q77g3.jpg" style="vertical-align: -23.0px;" /> is 
The variables are found to be related by the equation 
Use the information given in the table to write a matrix equation which when solved will yield the values of a, b, and c. Using the fact that the inverse of the matrix 
, solve for a, b, and c. Then find the value of a car that is 8 years old and is rated to be in condition 10.
A. $8600
B. $8375
C. $8400
D. $8420