Solve the problem.The decay of 192 mg of a radioactive substance is given by A(t) = 192e-0.015t, where t is time in years. Find the amount left after 40 years.
A. 105
B. 53
C. 104
D. 189
Answer: A
Mathematics
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Provide an appropriate response.A farmer bought 120 piglets at the local auction. He was able to raise 115 of them to market weight. What percent, to the nearest tenth percent, of loss did he incur?
A. 95.8% B. 1.04% C. 4.2% D. 4.1%
Mathematics
Graph the system of inequalities.-x + 2y ? -63x + 2y > -18
A. 
B. 
C. 
D. 
Mathematics
Factor the polynomial completely. If the polynomial cannot be factored, write "prime."x2 - 10x + 21
A. prime B. (x - 7)(x - 3) C. (x + 7)(x + 1) D. (x + 7)(x - 3)
Mathematics
Write the equation in standard form. Then identify the vertex of the parabola.y = x2 + 6x - 7
A. y = (x + 3)2 - 16; (-3, -16) B. y = (x - 3)2 - 7; (-3, -7) C. y = (x + 3)2 - 9; (-3, -9) D. y = (x + 3)2 - 16; (3, -16)
Mathematics