Solve the problem.The decay of 200 mg of an isotope is given by 
where t is time in years since the initial amount of 200 mg was present. Find the amount left (to the nearest mg) after 71 years.
A. 43 mg
B. 198 mg
C. 85 mg
D. 84 mg
Answer: C
Mathematics
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Perform the addition or subtraction.(7x2 + 4x + 10) - (-4x2 - 9)
A. 11x2 + 4x + 19 B. 11x2 + 13x + 10 C. 3x2 + 13x + 10 D. 3x2 + 4x + 19
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Multiply mentally.(-a2 - 3)2
A. a4 - 6a2 + 9 B. -a4 + 6a2 + 9 C. a4 + 9 D. a4 + 6a2 + 9
Mathematics
Solve the problem.A famous golfer tees off on a straight 390 yard par 4 and slices his drive to the right. The drive goes 290 yards from the tee. Using a 7-iron on his second shot, he hits the ball 170 yards and it lands inches from the hole. How many degrees (to the nearest degree) to the right of the line from the tee to the hole did he slice his drive?
A. 24° B. 43° C. 113° D. 52°
Mathematics
Add the numbers using the number line.-11 + 8.5
A. -2.5 B. -3.5 C. 3.5 D. 2.5
Mathematics