Use the simple interest formula.Melissa invested a sum of money at 3% annual simple interest. She invested three times that sum at 5% annual simple interest. If her total yearly interest from both investments was $7200, how much was invested at 3%?
A. $40,000
B. $270,000
C. $30,000
D. $90,000
Answer: A
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for x in 
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A. 0.500 B. 0.447 C. 0.445 D. 0.489
Calculate.7.75 ÷ (-0.5)
A. -155 B. -15.5 C. 155 D. 15.5
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A. {22, 23, 25, 27} B. {(22, 2008), (23, 2009), (25, 2010), (25, 2011), (27, 2012)} C. {(2008, 22), (2009, 23), (2010, 25), (2011, 25), (2012, 27)} D. {2008, 2009, 2010, 2011, 2012}
Solve the problem.The sum of the squares of the digits of a positive two-digit number is 61, and the tens digit is 1 more than the units digit. Find the number.
A. 56 B. 45 C. 65 D. 54