Solve the system mentally, without the use of a calculator or pencil-and-paper calculation. Try to visualize the graphs of both lines.x + 0y = 90x + y = 4
A. x = 9; y = 4
B. x = 4; y = 9
C. x = 9; y = 2
D. x = 2; y = 
Answer: A
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Use logarithmic differentiation to find the derivative of y with respect to the independent variable.y = 3t
A. 
B. 3t
C. 
D. 
Simplify by using the order of operations. Round your answer to the nearest hundredth.(-9.4)2 + 1.9 - 8.4
A. 81.86 B. 2.9 C. 8.41 D. 12.3
Set up an equation that can be used to solve the problem. Solve the equation and answer the question asked. You inherit $10,000 with the stipulation that for the first year the money must be invested in two stocks paying 6% and 11% annual interest, respectively. How much should be invested at each rate if the total interest earned for the year is to be $800?
A. $7000 invested at 6%; $3000 invested at 11% B. $4000 invested at 6%; $6000 invested at 11% C. $5000 invested at 6%; $5000 invested at 11% D. $6000 invested at 6%; $4000 invested at 11%
Use the laws of exponents to simplify. Write the answer with positive exponents.
A. y1/2
B. y
C. y2/3
D. 