S-2-2t Câu 12: Đường thẳng d đi qua điểm A(-2; -3) và có VTCP u =(-2;1) có phương trình là
A.
x = -2- 2t
y=1 - 3t
B.
x= -2+t
y=-3-2t
D.
x=-2-3t.
y=1-2t
C.
x=-2-2t
y= -3+t
II). Phần Tự Luận (4 điểm)
Câu 1: (4 điểm) Cho tam giác ABC biết A(2;-1), B(1;3); C(0; 1)
a. Viết phương trình tổng quát của đường thẳng AB, trung tuyến AM của tam giác.
b. Viết phương trình đường tròn (C) tâm C tiếp xúc với đường thẳng AB,
c. Viết phương trình tiếp tuyến của đường tròn (C) biết tiếp tuyến song song với đường thẳng BC.

Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?

Four equations are shown below.equation 1: y=2*equation 2: y=2x-5equation 3: y=x2 + 6equation 4: tdentify one linear equation and one nonlinear equation from the list.why each equation you identified is linear or nonlinear.nd one nonlinear equation from the list. state a reasonlinear equation

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?