Simplify.6.3 × 4.7 + 0.9 ÷ 7.2
A. 3.15
B. 29.735
C. 4.2375
D. 4.9
Answer: B
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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
Find the unknown number in the proportion. Round answer to the nearest hundredth when necessary.
= 
A. x = 60.17 B. x = 14.25 C. x = 47.5 D. x = 90.25
Find the distance d(P1, P2) between the points P1 and P2.P1 = (5, -7); P2 = (3, -3)
A. 12
B. 2
C. 12
D. 6
Compute the extension totals and the invoice total.
A. 
B. 
C. 
D. 