Solve the system by the substitution method. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. infinitely many solutions; {
y - 2x = 3} or {
3y = 6x + 9}
B. {(1, 1)}
C. no solution; ?
D. {(-1.5, -1)}
Answer: A
Mathematics
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Use identities to simplify the expression.
- tan x
A. - cot x
B. tan x
C. 
D. cot x
Mathematics
Determine if the series converges or diverges. If the series converges, find its sum.
A. converges; 
B. converges; ln 5
C. diverges
D. converges; 
Mathematics
Provide an appropriate response.Rationalize the denominator and simplify: 
Fill in the blank(s) with the appropriate word(s).
Mathematics
Use the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 to find how many numbers can be formed. The first digit may not be 0.Form a 5-digit odd number. Digits may not be repeated.
A. 45,000 B. 15,120 C. 22,680 D. 90,000
Mathematics