Rewrite the sum using sigma notation.
+ 
+ 
+ 
+ 
A. 
B. 
C. 
D. 
Answer: A
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Find all the roots of the function. Use preliminary analysis and graphing to determine good initial approximations. Round to six decimal places.f(x) = cos 2x - 
+ 3
A. x ? -4.190947, 1.190947 B. x ? -2.801947, 2.579947 C. x ? -2.690947, 2.690947 D. x ? -2.579947, 2.801947
Solve the problem.A bus is driven for 9 hours, part of the time at 70 miles per hour and the rest of the time at 60 miles per hour. The total distance traveled was 
miles. How long did the bus travel at 70 miles per hour?
A. 360 hours B. 210 hours C. 3 hours D. 6 hours
Solve by using the square root property.7x2 - 35 = 0
A. x = ± 
B. x = ± 
C. x = ± 
D. x = 
Use your estimation skills to pick the most reasonable answer. Do not solve the problem.8 - 1.25
A. 0.675 B. 6.75 C. 0.0675