Solve the problem.A tank initially contains 140 gal of brine in which 40 lb of salt are dissolved. A brine containing 1 lb/gal of salt runs into the tank at the rate of 6 gal/min. The mixture is kept uniform by stirring and flows out of the tank at the rate of 10 gal/min. Write, in standard form, the differential equation that models the mixing process.
A. 
= 6 - 
y
B. 
+ 
y = 10
C. 
+ 
y = 6
D. 
+ 
y = 6
Answer: C
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Express the number in scientific notation.2500
A. 2.5 × 10-2 B. 2.5 × 10-3 C. 2.5 × 103 D. 2.5 × 102
Find fractional notation for the ratio. You need not simplify.In this rectangle, find the ratios of length to width and of width to length.
A. 
; 
B. 
; 
C. 
; 
D. 
; 
Perform the exponentiation.-53
A. -15 B. 125 C. -125 D. 15
Solve.A company makes 3 types of cable. Cable A requires 3 black, 3 white, and 2 red wires. B requires 1 black, 2 white, and 1 red. C requires 2 black, 1 white, and 2 red. They used 100 black, 110 white and 90 red wires. How many of each cable were made?
A. 10 cable A 20 cable B 30 cable C B. 10 cable A 30 cable B 20 cable C C. 10 cable A 103 cable B 20 cable C D. 10 cable A 30 cable B 93 cable C