The Richter scale converts seismographic readings into numbers for measuring the magnitude of an earthquake according to this function M(x) = log 
, where xo = 10-3.Find the magnitude (to one decimal place) of an earthquake whose seismographic reading is 2000 millimeters at a distance of 100 kilometers from its epicenter.
What will be an ideal response?
The magnitude of the earthquake measures 6.3 on the Richter scale.
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In order to determine the effectiveness of a new vaccine that is alleged to cure "math anxiety," a study was conducted. One thousand volunteer college students enrolled in math courses across the U.S. were chosen. The 1000 students were broken up into two groups. Those enrolled in calculus courses were given the real vaccine. The students in developmental (remedial) math courses were given a fake vaccine consisting of sugared water. None of the students knew whether they were being given the real or the fake vaccine, but the researcher conducting the study knew. At the end of the semester the students were given a test that measured their level of math anxiety. The students in the treatment group showed significantly lower levels of math anxiety than those in the control group. On the
basis of this experiment the vaccine was advertised as being highly effective in fighting math anxiety.This study can best be described as a A. double-blind controlled placebo experiment. B. double-blind randomized controlled experiment. C. blind randomized controlled experiment. D. blind controlled placebo experiment. E. none of these
For the circuit equations below find I1 and I2.
40I1 + 10I2 = 9 10I1 + 40I2 = 6 a. Ý2A, .1A b. 2 mA, 10 mA c. 20 mA, 10 mA
Solve for the missing values. Round money to the nearest cent, rate to the nearest tenth of a percent, and time to the nearest day.Principal: $56,130Interest: $9175Rate: 11.9%Time: 
daysMaturity value: 
A. 463 days; $65,405 B. 547 days; $653,050 C. 495 days; $65,305 D. 496 days; $65,405
Solve.The FDA approves a new drug and has confirmed by independent research that the strength of the reaction to the drug is given by the formula 
where d is the dosage amount of the drug and ? is a constant. Find an equivalent expression for S(d) by factoring out a common factor.
A. S(d) = d2
B. S(d) = 
(? - d)
C. S(d) = 
D. S(d) = d2