The equation gives the position s = f(t) of a body moving on a coordinate line (s in meters, t in seconds).s = 4 sin t - cos tFind the body's velocity at time t = ?/4 sec.
A. - 
m/sec
B. 
m/sec
C. - 
m/sec
D. 
m/sec
Answer: D
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Use the formula for the sum of the first n terms of a geometric sequence to solve.Find the sum of the first 10 terms of the geometric sequence: -6, -18, -54, -162, -486, . . . .
A. -177,164 B. -177,142 C. -177,144 D. -177,107
Divide. Write the answer in lowest terms and as a whole or mixed number where possible.28 ÷ 
A. 21
B. 37
C. 
D. 7
Write a system of linear equations in three variables, and then use matrices to solve the system.There were approximately 100,000 vehicles sold at a particular dealership last year. The dealer tracks sales by age group for marketing purposes. The percentage of 36- to 59-year-old buyers and the percentage of buyers 60 and older combined exceeds the percentage of buyers 35 and younger by 34%. If the percentage of buyers in the oldest group is doubled, it is 25% less than the percentage of users in the middle group. Find the percentage of buyers in each of the three age groups.
A. 33% 35 and younger; 53% 36-59 year olds; 14% 60 and older B. 27% 35 and younger; 55% 36-59 year olds; 18% 60 and older C. 14% 35 and younger; 53% 36-59 year olds; 33% 60 and older D. 35% 35 and younger; 50% 36-59 year olds; 15% 60 and older
Solve and check your answer.
- 
= 
A. 
B. 
C. - 
D. - 