Solve the problem.Use the formula M = log (I/I0), where the magnitude of an earthquake on the Richter scale is based on I, the measurement of a seismic wave, and I0, the measurement of a seismic wave of a level zero earthquake with the same epicenter. If an earthquake measured 7.2 on the Richter scale, what was the intensity of the earthquake? Round to the nearest whole number.
A. 12,589,254
B. 1,584,893
C. 1338
D. 15,848,932
Answer: D
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A 1500-liter tank contains 70 liters of a 30% acid solution and you add x liters of a 70% acid solution to the tank. If the function C, which represents the proportion of acid to the total solution in the final mixture, is given by 
determine the domain based upon the physical constraints of the problem.
a. 
b. 
c. 
d. 
Solve the problem.Stephanie receives a salary of $650 per month plus a commission of 5.5% on the first $3,000 of sales, and 7% of all sales over $3,000. Find Stephanie's wages for the month if her sales were $9960.
A. $652.20 B. $1512.20 C. $1302.20 D. $2787.20
Graph the line containing the point P and having slope m.P = (4, 0); m = - 2 
A. 
B. 
C. 
D. 
Solve the system by using the inverse of the coefficient matrix. x + y + z = 4 x - y + 4z = -195x + y + z = 24
A. No solution B. (-5, 4, 5) C. (-5, 5, 4) D. (5, 4, -5)