Find the center (h, k) and radius r of the circle with the given equation. x2 + (y + 7)2 = 81
A. (h, k) = (0, -7); r = 81
B. (h, k) = (-7, 0); r = 81
C. (h, k) = (-7, 0); r = 9
D. (h, k) = (0, -7); r = 9
Answer: D
You might also like to view...
Use the exponential key to find an approximation to the nearest thousandth.112/5
A. 2.870 B. 2.609 C. 401.312 D. 4.400
Simplify the algebraic expression.18x2 - 18x2
A. 0 B. -36x2 C. x2 D. cannot be simplified
Solve the problem.In a two-card hand, what is the probability of holding only face cards? (Aces are not face cards.)
A. 
B. 
C. 
D. 
Solve the problem.Prices in an economy with a 12% annual inflation rate can be modeled by P = pert, where r is the inflation rate, t is the time in years, and p is the current price. How long will it take for prices in the economy to double at a 12% annual inflation rate?
A. 23.45 years B. 6.78 years C. 5.78 years D. 9.16 years