Solve the problem.A certain company has found that its expenditure rate per day (in hundreds of dollars) on a certain type of job is given by 
where x is the number of days since the start of the job. Find the expenditure if the job takes 8 days.
A. $33,600
B. $8200
C. $82
D. $336
Answer: A
Mathematics
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The vector r(t) is the position vector of a particle at time t. Find the angle between the velocity and the acceleration vectors at time t = 0.r(t) = sin-1(9t)i + ln(2t2 + 1)j + 
k
A. 
B. 
C. 
D. 0
Mathematics
Solve the equation.2(y + 8) = 3(y - 8)
A. -40 B. 40 C. 8 D. -8
Mathematics
Approximate, to the nearest tenth, the total surface area of the cone satisfying the given conditions.radius = 7 cm, height = 5 cm
A. 153.9 cm2 B. 78.5 cm2 C. 342.9 cm2 D. 109.9 cm2
Mathematics
Perform the indicated operation and write the answer in lowest terms.- 
- 
A. 
B. 
C. 
D. 
Mathematics