Solve the problem.The function A = A0e-0.00693x models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 700 pounds of the material are placed in the vault, how much time will need to pass for only 431 pounds to remain?
A. 80 yr
B. 140 yr
C. 70 yr
D. 75 yr
Answer: C
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Solve the problem. Use a FICA rate of 6.2%, a Medicare rate of 1.45%, and an SDI rate of 1%. Assume the person's earnings will not exceed $31,800 for the year. Round to the nearest cent if needed.Donald Ruffano is paid a salary of $419 per week plus a commission of 3% on sales. During a recent week, he had sales of $9846.23. Find his Social Security tax, Medicare tax, and SDI deduction for the week.
A. $17.53, $2.95, $2.83 B. $44.29, $10.36, $7.14 C. $18.31, $4.28, $2.95 D. $25.98, $6.08, $4.19
Translate into an equation, and then solve the equation.Three added to what number equals seven?
A. 3 + x = 7; 5 B. 3 = x + 7; 4 C. 3 + x = 7; 3 D. 3 + x = 7; 4
Graph the polynomial function. f(x) = -2x(x + 2)3 
A. 
B. 
C. 
D. 
Factor completely. If the polynomial is prime, so state.16x2 - 25y2
A. (4x + 5y)(4x - 5y) B. (4x + 5y)2 C. (4x - 5y)2 D. prime