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 7.7 millimeters at a distance of 100 kilometers from its epicenter? Round the answer to the nearest tenth.
A. 3.9
B. 2.7
C. 886.5
D. 2.9
Answer: A
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If 
, calculate the value of 
.
?
A. 185.27 B. 613.71 C. 187.82 D. 402.27
Divide the following numbers.4.54 ÷ 5
A. 19.08 B. 9.08 C. 1.908 D. 0.908
Use a graphing calculator to plot the data and find the quadratic function of best fit.A small manufacturing firm collected the following data on advertising expenditures (in thousands of dollars) and total revenue (in thousands of dollars). 
Find the quadratic function of best fit.
A. R(x) = -0.024x2 + 7.13x + 6209 B. R(x) = -0.015x2 + 4.53x + 6123 C. R(x) = -0.091x2 + 5.95x + 6337 D. R(x) = -0.31x2 + 2.63x + 6128
Find the indicated term or coefficient of the binomial expansion.Find the 4th term of the expansion of (s - t)10.
A. -120s7t3 B. - s7t3 C. s6t4 D. 210s6t4