Solve the problem.For what values of t is r(t) = ti + 
j continuous?
A. {t ? ?: t ? -8}
B. {t ? ?: t ? 0 and t ? -8}
C. {t ? ?: t ? 0}
D. {t ? ?: t ? 0 and 
? 8}
Answer: B
Mathematics
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Determine if matrix A is invertible.A = 
A. Not invertible B. Invertible
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Simplify. Assume that all variables represent positive numbers.
A. 7.5x5z6
B. 15x5z6
C. 7.5x5yz6
D. 15x8z11
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Determine the rectangular equation of the curve whose parametric equations are given.x = 2t, y = t + 4; -2 ? t ? 3
A. y = 
x + 4; -4 ? x ? 6
B. y = 
x - 4; -? < x < ?
C. y = x2 + 1; -2 ? x ? 2
D. y = -2x + 4; -? < x < ?
Mathematics