Find the radius or diameter as requested.Find the diameter.
A. 3824.55 ft
B. 17.45 ft
C. 109.586 ft
D. 69.8 ft
Answer: D
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Find the center-radius form of the equation of the circle.center (-8, -7), radius 
A. (x + 8)2 + (y + 7)2 = 3 B. (x - 7)2 + (y - 8)2 = 9 C. (x + 7)2 + (y + 8)2 = 9 D. (x - 8)2 + (y - 7)2 = 3
Sketch the graph of the equation.y = (x + 1)2
A. 
B. 
C. 
D. 
Solve the formula for the specified variable.P = 
for r
A. r = P - tA
B. r = 
C. r = 
D. r = 
Solve the problem.The magnitude of an earthquake, measured on the Richter scale, is given by 
where I is the amplitude registered on a seismograph located 100 km from the epicenter of the earthquake, and I0 is the amplitude of a certain small size earthquake. Find the Richter scale rating of an earthquake with an amplitude of 107.8 I0.
A. 2.2 B. 17.8 C. 18 D. 7.8