If A denotes the area of the sector of a circle of radius r formed by the central angle ?, find the missing quantity. If necessary, round the answer to two decimal places.r = 8 feet, A = 51 square feet, ? = ?
A. 187,108.28°
B. 45.68°
C. 91.36°
D. 93,554.14°
Answer: C
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Solve the problem.A tank initially contains 100 gal of brine in which 40 lb of salt are dissolved. A brine containing 
of salt runs into the tank at the rate of 4 gal/min. The mixture is kept uniform by stirring and flows out of the tank at the rate of 3 gal/min. Find the solution to the differential equation that models the mixing process.
A. y = 4(50 + t) - 
B. y = 4(50 + t) - 
C. y = 2(100 + t) - 
D. y = 2(100 + t) - 
Write the expression in standard form.
A. 4 - 4i
B. 4 - i
C. 4 - i
D. 4 - 
Determine whether A = B, A ? B, B ? A, A ? B, B ? A, or if none of these applies.A = {3, 4, 5}B = {2, 3, 4, 5}
A. A ? B B. A ? B C. B ? A and B ? A D. A ? B and A ? B
Find E if R1 = 100 ê, R2 = 200 ê and V1 = 30 V.
E(R1) V1 = ÄÄÄÄÄÄÄÄÄ. (R1 + R2) What will be an ideal response?