Obtain an equivalent system by performing the stated elementary operation on the system.Interchange equations 1 and 3.4x + 4y + z = -12x - 5y - z = 163x + 5z = 18
A. 3x + 5z = 18
2x - 5y - z = 16
4x + 4y + z = -1
B. 2x - 5y - z = 16
4x + 4y + z = -1
3x + 5z = 18
C. 3x + 5z = 18
4x + 4y + z = -1
2x - 5y - z = 16
D. x + 4y + 4z = -1
2x - 5y - z = 16
3x + 5z = 18
Answer: A
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Solve the problem.Let y(t) be the population of a species of plant that is being harvested, for t ? 0. Consider the harvesting model 
where h is the annual harvesting rate, y0 is the initial population of the species, and t is measured in years. If y0 = 5000, what harvesting rate should be used to maintain a constant population of y = 5000, for t ? 0?
A. h = 5000 yr-1 B. h = 10 yr-1 C. h = 100 yr-1 D. h = 25 yr-1
Find the derivative of the function.y = ln (x + 3)5
A. 
B. 
C. 
D. 
Solve.The area of a rectangle with sides of length 
and 
is given by the function 
The area of a smaller rectangle inside of the larger rectangle is given by the function 
Find a function h that gives the area of the region inside the larger rectangle and outside the smaller rectangle.
A. h(x) = x4 + 21x3 + 42x2 + 80x
B. h(x) = 
C. h(x) = 15x + 80
D. h(x) = 2x2+ 21x + 80
Determine the five-number summary of the given data.The normal annual precipitation (in inches) is given below for 21 different U.S. cities.39.131.1?18.533.5?27.127.88.623.3?42.632.7?20.9?12.05.113.1?22.3?10.915.8?25.417.215.5?51.7
A. 5.1, 13.700, 22.3, 30.275, 51.7 B. 5.1, 14.30, 22.3, 31.90, 51.7 C. 5.1, 13.700, 21.60, 30.275, 51.7 D. 5.1, 14.30, 21.60, 31.90, 51.7