Solve the system by substitution.x + y = 0x - y = 10
A. {(4, -4)}
B. {(-5, -4)}
C. {(5, -5)}
D. ?
Answer: C
Mathematics
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The position vector of a particle is r(t). Find the requested vector.The velocity at t = 0 for r(t) = ln(t3 - 6t2 + 1)i - 
j - 1cos(t)k
A. v(0) = 
j
B. v(0) = 1i - 
j
C. v(0) = 1i - 
j + 1k
D. v(0) = - 
j
Mathematics
Evaluate the expression for the given replacement values.x ? y, for x = 4 and y = 37
A. 128 B. 131 C. 248 D. 148
Mathematics
Find the real solutions of the equation.
= x
A. {-2, 8}
B. {- 
}
C. {8}
D. no real solution
Mathematics
Solve the equation by completing the square.15d2 + 28d + 12 = 0
A. 
B. 
C. 
D. 
Mathematics