Solve.Use the formula R = log 
+ B to find the intensity R on the Richter scale, given that amplitude a is 245 micrometers, time T between waves is 2.5 seconds, and B is 3. Round answer to one decimal place.
A. 2
B. 7.6
C. 9
D. 5
Answer: D
Mathematics
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Write the phrase as a variable expression. Use x to represent "a number."9 less than 7 times a number
A. 9x - 7 B. 7 - 9x C. 9 - 7x D. 7x - 9
Mathematics
A formula is given, along with values for all but one of the variables in the formula. Find the value of the variable that is not given. Round to the nearest hundredth when necessary.C = 2?r; C = 31.40, ? = 3.14
A. r = 10 B. r = 5 C. r = 197.19 D. r = 34.54
Mathematics
Multiply.1536 × 78
A. 10,762 B. 23,040 C. 119,808 D. 107,528
Mathematics
Determine whether the given function is one-to-one. If it is one-to-one, find a formula for the inverse.f(x) = 
A. f-1(x) = (x + 4)2
B. f-1(x) = x2 - 4, x ? 0
C. Not one-to-one
D. f-1(x) = 
Mathematics