11. Select the proper placement for parentheses to speed up the addition for the expression 2 + 9 + 8 + 1

A. (8 + 2) + (9 + 1) B. (9 + 2) + (8 + 1) C. (8 + 9) + (2 + 1) D. (1 + 2) + (9 + 8)

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A traveler is walking on a moving walkway in an airport The Traveler must walk back on the walkway to get a bag he forgot the Travelers ground speed is 2ft/s against the walkway and 6ft/s with the walkway what is the Travellers speed off the walkway

Let X denote the reaction time, in seconds, to a certain stimulus and Y denote the temperature (◦F) at which a certain reaction starts to take place. Suppose that two random variables X and Y have the joint density f (x, y) = 4xy, 0

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There is a geometric theorem that says if two lines are perpendicular to the same line, they are parallel to each other explain why this is true by writing & comparing equations

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A motorboat travels 448 kilometers in 8 hours going upstream and 516 kilometers in 6 hours going downstream. What is the rate of the boat in still water and what is the rate of the current?

Jack made 50% more smoothies than yesterday. If he made 30 smoothie today how many did he make yesterday?