Solve the problem.A sample of 200 grams of radioactive substance decays according to the function 
where t is the time in years. How much of the substance will be left in the sample after 20 years? Round your answer to the nearest whole gram.
A. 1 g
B. 119 g
C. 26 g
D. 0 g
Answer: B
Mathematics
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Provide an appropriate response.
Find the area of the shaded ring:
A. 1,256.64 m2 B. 942.48 m2 C. 472.24 m2 D. 314.16 m2
Mathematics
Find the surface area generated by rotating the lemniscate r² = 10cos2? about the line ?= ?.
What will be an ideal response?
Mathematics
Graph the function. State the amplitude, period, and phase shift.y = 4
sin x - 4 cos x
x-scale = 
y-scale = 2
A. Amplitude 8, period 2?, phase shift 
x-scale =  | y-scale = 2 |
B. Amplitude 4, period 2?, phase shift -
x-scale =  | y-scale = 2 |
C. Amplitude 4, period 2?, phase shift
x-scale =  | y-scale = 2 |
D. Amplitude 8, period ?, phase shift
x-scale =  | y-scale = 2 |
Mathematics
Simplify, if possible.
A. 
B. 
C. 
D. 
Mathematics