Solve:
x
Solve for x: 2.5 = log ÄÄÄÄ
0.82
a. 1.64 ð 102
b. 2.59 ð 102
c. 3.16 ð 102
d. 0.62 ð 10-2
e. 3.98 ð 10-1
b. 2.59 ð 102
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The Richter scale converts seismographic readings into numbers for measuring the magnitude of an earthquake according to this function M(x) = log 
, where x0 = 10-3.What is the magnitude of an earthquake whose seismographic reading is 7.6 millimeters at a distance of 100 kilometers from its epicenter? Round the answer to the nearest tenth.
A. 880.8 B. 3.9 C. 2.9 D. 2.6
Factor the trinomial.4y2 + 12y + 9
A. (2y - 3)(2y - 3) B. (4y + 3)(y + 3) C. (2y + 3)(2y + 3) D. (4y + 1)(y - 9)
Find the value.Let C = 
and D = 
; C - 2D
A. 
B. 
C. 
D. 
The middle term of the trinomial has been rewritten. Now factor by grouping.12x2 - 9xy - 20xy + 15y2
A. (12x - 5y)(x - 3y) B. (3x + 5y)(4x - 3y) C. (3x - 5)(4x - 3) D. (3x - 5y)(4x - 3y)