Solve the formula for the specified variable.x = 
for y
A. y = 5x - w - z
B. y = 5x + w + z
C. y = 5x - 5w - 5z
D. y = x - w - z - 5
Answer: A
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Solve the problem.A tank initially contains 100 gal of brine in which 60 lb of salt are dissolved. A brine containing 4 lb/gal of salt runs into the tank at the rate of 8 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 = 32
B. 
+ 
y = 20
C. 
= 32 - 
y
D. 
+ 
y = 32
Combine.3.5 + (-2.1) - (-4.4) - 4.9 + (-0.2)
A. 0.7 B. 10.5 C. 1.7 D. 6.3
Convert the degree measure to radian measure. Use the value of ? found on a calculator and round as indicated.Round to the nearest hundredth of a radian.52°54'
A. 0.9 B. 0.89 C. 0.91 D. 0.92
Use the fact that the trigonometric functions are periodic to find the exact value of the expression. Do not use a calculator.cot 390°
A. - 
B. 
C. 
D. -