Solve the problem.Which of the following vectors is orthogonal to 20i - 8j?

A. w = 4i + 3j
B. w = 15i - 6j
C. w = 20i + 4j
D. w = -10i - 25j


Answer: D

Mathematics

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Perform the division. Write the answer with positive exponents.

A. 6x3 + 28x7 - 28x6 + 35x4 + 4x2
B. 42x8 + 4x2 - 4 +  + 
C. 6x2 + 4- 4 +  + 
D. 6x3 + 4x2  - 4

Mathematics

Use the definition to find an expression for the instantaneous velocity of an object moving with rectilinear motion according to the given function relating s (in ft) and t (in s).s = 4t + 3t3 

A. 4t + 9t2  B. 4t + 9t3  C. 4 + 9t2  D. 4 + 3t2 

Mathematics

Find a formula for the nth partial sum of the series and use it to find the series' sum if the series converges. +  +  + ... +  + ...

A. ; 4
B. ; 4
C. ; 4
D. ; 4

Mathematics

Evaluate the integral by changing the order of integration in an appropriate way.

A. 1 ln 3 (e - 1)
B. 1 ln 2 (e - 1)
C.  ln 2 (e - 1)
D.  ln 3 (e - 1)

Mathematics