Solve the equation.x2 - 81 = 80x
A. {-81, 1}
B. {-9, 9}
C. {-1, 81}
D. {-9}
Answer: C
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Solve the problem.In a chemistry class, 7 liters of a 4%-saline solution must be mixed with a 10% solution to get a 6% solution. How many liters of the 10% solution are needed?
A. 3.5 L B. 7.0 L C. 2.5 L D. 4.5 L
Solve the problem.An employee was paid $20,625 during the first half of last year. During the second half he was paid $40,858. How much more was his income during the second half?
A. $61,473 B. $20,233 C. $20,223 D. $61,483
Determine which is the better buy.A package of 6 bars of soap for $2.22 or a package of 9 bars of soap for $4.14
A. A package of 6 bars of soap B. A package of 9 bars of soap
Find the standard form of the equation of a circle that satisfies the given conditions.Center at (-10, 0); radius 8
A. x2 + (y + 10)2 = 8 B. (x + 10)2 + y2 = 64 C. x2 + (y - 10)2 = 8 D. (x - 10)2 + y2 = 64