Câu 1. Cho mệnh d dot hat e :^ *** forall x in mathbb R ,x^ 2 +3x+5>0" Mệnh đề phủ định của mệnh đề trên là A. forall x in mathbb R ,x^ 2 +3x+5<=0 . C. forall x in mathbb R .x^ 2 +3x+5<0 . B. exists x in mathbb R ,x^ 2 +3x+5<=0 . D. exists x in mathbb R ,x^ 2 +3x+5>0 .

1. during first 10 seconds 2. between 10 seconds and 35 seconds 3. during 35 seconds to 40 seconds

Abiologist is recording the loss of fish in a pond. he notes the number of fish, f, in the pond on june 1. on july 1 there were 63 fish in the pond, which is 52 fewer fish than were in the pond on june 1. which equation represents this situation? a. f – 52 = 63 b. f – 63 = 52 c. 63 – f = 52 d. f – 63 = –52

Which expression shows the sum of the polynomials with like terms grouped together