Find the exact value of the expression.tan 345°
A. 
B. 2 + 
C. -2 - 
D. 
Answer: C
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Solve.Find the hydrogen ion concentration of a solution whose pH is 8.2. Use the formula 
A. -0.9138139 B. 1.58 × 108 C. 0.91381385 D. 6.31 × 10-9
Solve the problem.A race car driver's speed is clocked at 140.399 mph at the end of her first lap, and at 165.743 mph at the end of the next lap. How much faster was she driving at the end of the second lap than at the end of the first?
A. 25.444 mph B. 25.354 mph C. 25.344 mph D. 24.344 mph
The total worldwide box-office receipts for a long-running movie are approximated by the function 
, where 
is measured in millions of dollars and x is the number of years since the movie's release. How fast are the total receipts changing 1 yr, 3
yr, and 5 yr after its release?
?
A. 
, 
, 
B. 
, 
, 
C. 
, 
, 
D. 
, 
, 
E. 
, 
, 
Graph the circle.x2 + y2 - 10x = -10y - 41 
A. 
B. 
C. 
D. 