Write the complex number in trigonometric form. Begin by sketching the graph to help find the argument ?.
?
What will be an ideal response?
Mathematics
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Solve the problem.A tank initially contains 140 gal of brine in which 60 lb of salt are dissolved. A brine containing 5 lb/gal of salt runs into the tank at the rate of 7 gal/min. The mixture is kept uniform by stirring and flows out of the tank at the rate of 5 gal/min. Write, in standard form, the differential equation that models the mixing process.
A. 
+ 
y = 35
B. 
+ 
y = 25
C. 
+ 
y = 35
D. 
= 35 - 
y
Mathematics
Rewrite the sum using sigma notation.
- 
+ 
- 
+ 
- 
A. 
B. 
C. 
D. 
Mathematics
Multiply.
? 
A. 10z
B. 
C. 
D. 
Mathematics
Multiply or divide as indicated. Write the answer in lowest terms.
÷ 
A. 
B. 
C. 
D. 
Mathematics