Solve the system of equations using substitution.
A. x = 6, y = 3; x = 3, y = 6
B. x = 10, y = 2; x = 2, y =10
C. x = 5, y = 4; x = 4, y = 5
D. x = 20, y = 1; x = 1, y = 20
Answer: C
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A. - 
B. 0
C. 
D. 
Rationalize the denominator and simplify. 
A. 
B. 
C. 
D. 
Graph the inequality.(x - 4)2 + (y + 3)2 ? 4
A. 
B. 
C. 
D. 
If an IRA is a variable-rate investment for 20 years at rate r percent per year, compounded monthly, then the future value S that accumulates from an initial investment of $4,000 is 
. What is the rate of change of S with respect to r and what does it tell us if the interest rate is 3%? Round your answer to two decimal places.
?
A. The future value increases by approximately $1,547.37 when the interest rate increases from 3% to 4%. B. The future value increases by approximately $1,452.97 when the interest rate increases from 3% to 4%. C. The future value increases by approximately $3,141.04 when the interest rate increases from 3% to 4%. D. The future value increases by approximately $1,154.17 when the interest rate increases from 3% to 4%. E. The future value increases by approximately $2,627.64 when the interest rate increases from 3% to 4%.