Solve by substitution and check.x + y = 9 y = 2x + 3

A. (7, 2)
B. (2, 7)
C. (3, 6)
D. (1, 9)


Answer: B

Mathematics

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Find the mass of the wire that lies along the curve r and has density ?.r(t) = 10i + (7 - 3t)j + 4tk, 0 ? t ? 2? ; ? = 4(1 + sin 4t)

A. 40? units B. 8? units C. 10 + 40? units D. 20 + 40? units

Mathematics

Round as indicated.96 to the nearest ten

A. 100 B. 80 C. 90 D. 110

Mathematics

Solve the system using the inverse of the coefficient matrix of the equivalent matrix equation. 3x - 8y - z = -1  x + 8y + 4z = 32 8x + y + z = 38

A. (-4, 1, 8) B. (4, 1, 5) C. (4, 5, 1) D. No solution

Mathematics

Indicate whether the function is one-to-one.A = {(-7, -7), (20, -8), (6, -19)}

A. Yes B. No

Mathematics