The letters r and ? represent polar coordinates. Write the equation using rectangular coordinates (x, y).r = 1 + 2 sin ?
A. x2 + y2 = 
+ 2x
B. x2 + y2 = 
+ 2y
C. 
= x2 + y2 + 2y
D. 
= x2 + y2 + 2x
Answer: B
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An amount P, invested at a simple interest rate r, will grow to an amount A in t years, according to the formula A = P ( 1 + r t ). Suppose a man invested some money at 5.4%. If after 7 years, he had $8,268.00 on deposit, what amount did he originally invest? Round your answer to the nearest integer.
A. P = $5,850 B. P = $6,200 C. P = $6,000 D. P = $6,100
Write the number in decimal notation. ? Gross domestic product of the United States in 2007: 1.3743021 × 1013 dollars ?
A. $13,743,021,000,000 B. $1,374,302,100,000 C. $13,743,021,000 D. $137,430,210,000 E. $137,430,210,000,000
Use the quotient rule to simplify the expression. Write the answer with only positive exponents.
A. -1010
B. 
C. 1010
D. 
Find the equation of the circle from the given information.Center at (1, -5), radius 
A. (x - 5)2 + (y + 1)2 = 169 B. (x + 1)2 + (y - 5)2 = 13 C. (x - 1)2 + (y + 5)2 = 13 D. (x + 5)2 + (y - 1)2 = 169