Solve the problem using matrices.Melody has $45,000 to invest and wishes to receive an annual income of $4290 from this money. She has chosen investments that pay 5%, 8%, and 12% simple interest. Melody wants to have the amount invested at 12% to be double the amount invested at 8%. How much should she invest at each rate?
What will be an ideal response?
$9000 at 5%, $12,000 at 8%, and $24,000 at 12%
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Write the set in set-builder notation.The set of all calculus books
A. {a calculus book} B. {x | x is a calculus book} C. {any calculus book} D. {x is a calculus book}
Multiply.(3m - 2w)(3m + 2w)
A. 9m2 - 12mw - 4w2 B. 3m2 - 2w2 C. 9m2 + 12mw - 4w2 D. 9m2 - 4w2
Solve the problem.Use the formula R = log
, 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. An earthquake was recorded which was 2,511,886 times more powerful than a reference level zero earthquake. What is the magnitude of this earthquake? (Round to the nearest tenth.)
A. 5.4 B. 6.4 C. 0.6 D. 14.7
Solve.
= 
A. {-4, 4} B. {4} C. {-4} D. ?