Use the distributive property to write the sum as a product.4a + 4b

A. 4(a + b)
B. 4(a + 4b)
C. 4a ? b
D. 8ab

Answer: A

Mathematics

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Find the unit tangent vector T and the principal unit normal vector N. r(t) = i + j + 4tk

A. T = (cos 0.75t)i - (sin 0.75t)j ; N = (-sin 0.75t)i - (cos 0.75t)j
B. T = (sin 0.75t)i - (cos 0.75t)j ; N = (-sin 0.75t)i - (cos 0.75t)j
C. T = (cos 0.75t)i - (sin 0.75t)j + k ; N = (-sin 0.75t)i - (cos 0.75t)j
D. T = (cos 0.75t)i - (sin 0.75t)j + k ; N = (-sin 0.75t)i - (cos 0.75t)j