Solve the problem.The half-life of an element is 4.5 × 1011 yr. How long does it take a sample of the element to decay to 
of its original mass? Use 
where A0 is the initial amount, T is the half-life, and t is the time. (Express results in scientific notation, rounded to the nearest hundredth.)
A. 1.29 × 1011 yr
B. 2.63 × 1011 yr
C. 1.26 × 1011 yr
D. 5.83 × 1011 yr
Answer: B
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Provide an appropriate response. Why are decibels used instead of bels in sound work?
What will be an ideal response?
Translate the situation into mathematical language. You need not actually solve the problem.Find two consecutive integers such that 3 times the first plus 7 times the second is 107.
A. Let h be the first integer; 7h(3(h + 1)) = 107 B. Let h be the first integer; 3h + 7(h + 1) = 107 C. Let h be the first integer; 7h + 3(h + 1) = 107 D. Let h be the first integer; 3h - 7(h + 1) = 107
Solve the problem.Let P = (x, y) be a point on the graph of y = 
. Express the distance d from P to the point (1, 0) as a function of x.
A. d(x) = 
B. d(x) = x2 - x + 1
C. d(x) = x2 + 2x + 2
D. d(x) = 
Find the exact value of the expression. Do not use a calculator.cot 45° - sin 60°
A. 
B. 
C. - 
D. 