Simplify. 3.4 × 42 + 6 ÷ 3 - (5.7 + 2.1)
A.
53.4
B.
58.6
C.
48.6
D.
60.2

Issof claims that the scale factor is 1/2. which statement about his claim is correct

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.

36x2 + 49y2 = 1,764 the foci are located at: (-√13, 0) and (√13,0) (0, -√13) and (0,√13) (-1, 0) and (1, 0)edit: the answer is (- the square root of 13, 0) and (the square root of 13, 0)