The table shows soybean production, in millions of tons, in Brazil's Cerrados region, as a function of the cultivated area, in millions of acres. Use technology to obtain the regression line. Round coefficients to two decimal places.
Area (Millions of Acres) - x2530324052Production (Millions of Tons) - y1425304060?
A. 
B. ?
C. ?
D. ?
E. ?
Answer: A
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Solve the problem.Vehicles in accidents often leave skid marks. To determine how fast a vehicle was traveling, officials often use a test vehicle to compare skid marks on the same section of road. If a vehicle involved in a crash left skid marks that are D feet long and a test vehicle traveling at v miles per hour leaves skid marks that are d feet long, then the speed of the vehicle in the crash is given by 
Determine V if v = 50 miles per hour, D = 289 feet, and d = 100 feet.
A. 80 miles per hour B. 85 miles per hour C. 170 miles per hour D. 95 miles per hour
Perform the indicated operations.
A. -1 B. 1 C. 9 D. -9
Determine if the matrix is in row-echelon form.
A. No B. Yes
Decide on a suitable restriction on the domain so that the function is one-to-one and the range is not changed.f(x) = (x - 4)2
A. [-4, 4) B. [-4, ?) C. [4, ?) D. (-4, 3)