Solve the problem.A boat travels d miles against the current whose rate is 8 mph. On the return trip, the boat travels with the same current. The expression 
+ 
, where r is the speed of the boat in calm water, represents the total amount of time in hours it takes for the entire trip. Represent this amount of time as a single rational expression.
A. 
B. 
C. 
D. 
Answer: B
Mathematics
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Solve the problem.When the temperature is 39°F, what is the temperature in degrees Celsius? Round your answer to the nearest tenth if necessary.
A. 102.2°C B. 3.9°C C. 38.2°C D. 10.3°C
Mathematics
If the lines determined by two linear equations meet, then the crossing point corresponds to the solution of the system of two linear equations in two unknowns.
Answer the following statement true (T) or false (F)
Mathematics
Multiply using duplation and mediation.50 × 83
A. 4250 B. 4160 C. 4150 D. 4140
Mathematics
Find the linear function that is the best fit for the given data. Round decimal values to the nearest hundredth, if necessary.
A. y = 6.8x - 150.7 B. y = 6.2x - 140.4 C. y = -6.8x + 150.7 D. y = -6.2x + 140.4
Mathematics