Simplify the expression using multiplication.The surface area of a right circular cone with radius r and length l is 
Write this formula without parentheses and without multiplication signs.
A. A = ?r2 + ?rl
B. A = ?r + ?rl
C. A = ?r2 + l
D. A = ?r + ?l
Answer: A
Mathematics
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Find the derivative of the function.
?
?
A. 
B. 
C. 
D. 
Mathematics
Eliminate the parameter to obtain a Cartesian equation of the curve.x = 7 cos t, y = 7 sin t, 0 ? t ? 2?
A. x2 - y2 = 7, -7 ? x ?7 B. x2 - y2 = 49, -7 ? x ?7 C. x2 + y2 = 7, -7 ? x ?7 D. x2 + y2 = 49, -7 ? x ?7
Mathematics
Solve the system by the addition method. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. {(7, 28)}
B. 
C. {(2, 4)}
D. no solution; ?
Mathematics
Find the y-intercept for 
.
A. 
B. 
C. 
D. 
Mathematics