Solve.In a chemistry class, 7 liters of a 4% silver iodide solution must be mixed with a 10% solution to get a 6% solution. How many liters of the 10% solution are needed?
A. 4.5 L
B. 2.5 L
C. 7.0 L
D. 3.5 L
Answer: D
Mathematics
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Solve the problem.The rate of water usage for a business, in gallons per hour, is given by 
where t is the number of hours since midnight. Find the average rate of water usage over the interval 
A. 2.63 gallons per hour B. 2.71 gallons per hour C. 2.62 gallons per hour D. 0.05 gallons per hour
Mathematics
Factor.24x3y + 60x2y + 36xy
A. 3xy(2x + 1)(4x + 12) B. 3y(2x + 1)(4x + 12) C. 3xy(12x + 2)(x + 6) D. 3xy(2x + 2)(4x + 6)
Mathematics
Solve the equation.90x-2 - 5x-1 = 20
A. 
B. 
C. 
D. 
Mathematics
Find the center (h, k) and radius r of the circle. Graph the circle.x2 + y2 - 2x - 2y - 7 = 0
A. Center (1, -1), r = 3
B. Center (1, 1), r = 3
C. Center (-1, -1), r = 3
D. Center (-1, 1), r = 3
Mathematics