Ineed will give brainliest plzzz don't get me wrong!
which expression is equivalent to −2.1+(−5.9)+(−3.7) ?

s. −(2.1−5.9)+(−3.7)

t. (2.1+5.9+3.7)

f. −2.1−(5.9+3.7)

u. (2.1+5.9)+(−3.7)

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.)