Calculate the left Riemann sum for the function over the given interval using the given values of ?n.
?
over 
?
A. Left Sum = - 5
B. Left Sum = 5
C. Left Sum = 4
D. Left Sum = 7
E. Left Sum = - 4
Answer: B
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Solve the problem.A couple have bought a new house and are comparing quotes from two moving companies for moving their furniture. Company A charges $100 for the truck and $45 per hour for the movers. Company B charges $90 for the truck and $60 per hour for the movers. Create a cost equation for each company where y is the total cost and x is the number of hours of labor. Write a system of equations.
A. 45y = x + 100 60y = x + 90 B. y = 45x + 100 y = 60x + 90 C. 45y = 100x 60y = 90x D. y = 100x + 45 y = 90x + 60
Subtract.-15 - (-6)
A. 21 B. -21 C. 9 D. -9
Find the one-sided limit.
(2 cos x)
A. 0 B. -2 C. 2 D. does not exist
Find all values of ?, if ? is in the interval [0, 360°) and has the given function value.sec ? = - 
A. 45° and 225° B. 135° and 225° C. 45° and 315° D. 225° and 315°