Use the decibel scale to answer the question.How does the intensity of sound from a concert speaker at a distance of 20 meters compare to the intensity at a distance of 60 meters?
A. Factor of 3 weaker at 60 m.
B. Factor of 36 weaker at 60 m.
C. Factor of 30 weaker at 60 m.
D. Factor of 9 weaker at 60 m.
Answer: D
Mathematics
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Find the product.(-11a3x4)(6a9x9 + 8x5 - 10a)
A. -66a9x9 - 88x5 + 110a B. -66a12x13 + 8x5 - 10a C. -66a12x13 - 88a3x9 - 10a D. -66a12x13 - 88a3x9 + 110a4x4
Mathematics
Multiply or divide as indicated. Make sure that your answer is reasonable by estimating first. 48.9 ÷ 5
A. 0.978 B. 9.78 C. 0.102 D. 97.8
Mathematics
Find the probability.Two dice are rolled. Find the probability that the score on the dice is either 8 or at most 3.
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.Use determinants to find the area of the triangle with vertices (3, 6), (5, 1), and (1, 0).
A. 10.0 B. 10.5 C. 11.0 D. 9.5
Mathematics