ABCD is a parallelogram. The diagonals of ABCD intersect at O.
B
с
b
OA = a and OB = b
o
a) Express the vector CÁ in terms of a.
a
A
D
b) Express the vector AB in terms of a and b.
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c) Express the vector BC in terms of a and b.

Which of the following statements would be sufficient to prove that parallelograms pqrs is a rectangle ?

Me with this assignment ! i only partially understand, so explain. also it's a work sample. at the championship bike race, steve and paula were fighting for first place. steve was 175 feet ahead of paula and had only 300 feet left to go. he was very tired and was going only 9 feet per second. paula was desperate to catch up and was going 15 feet per second. who won the bike race and by how far did she/he win?

Astandard deck of cards contains 52 cards. one card is selected from the deck. (a) compute the probability of randomly selecting a diamond or heart. (type an integer or a decimal rounded to three decimal places as needed.) (b) compute the probability of randomly selecting a diamond or heart or club. (type an integer or a decimal rounded to three decimal places as needed.) (c) compute the probability of randomly selecting queen or club. (type an integer or a decimal rounded to three decimal places as needed.)