Multiply. Assume that all variables represent positive values.( + 2)( + 3)

A. x + 5 + 6
B. x + 5 + 6
C.  + 5 + 6
D. x2 + 5 + 6

Answer: B

Mathematics

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Fill in the blank with one of the words or phrases listed below. In the equation y = kx, y varies  as x.

A. parallel B. inversely C. directly D. jointly

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Find the work done by F over the curve in the direction of increasing t.F = 2yi + j + (3x + 3z)k; C: r(t) = ti + t2j  + tk, 0 ? t ? 2

A. W = 22 + 20
B. W =  + 20
C. W =  + 
D. W = 0

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Complete the identity.sec x -  = ?

A. 1 + cot x B. -2 tan2 x C. sin x tan x D. sec x csc x

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Solve.The pH of a solution ranges from 0 to 14. An acid has a pH less than 7. Pure water is neutral and has a pH of 7. The pH of a solution is given by  where x represents the concentration of the hydrogen ions in the solution in moles per liter. Find the pH if the hydrogen ion concentration is 

A. 5.21 B. 5.79 C. 6.21 D. 6.79

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Mathematics