3. Is the sequence arithmetic? If so, find the common difference.
11.1, 21.6, 32.2, 42.6
[A] yes, 10.4
[B] no
(C) yes, 10.7
[D] yes, 10.5

answer: standard form is ax^2 + bx + c = 0

step-by-step explanation:

standard form is ax^2 + bx + c = 0

(2x + 1)(x - 2) = 0

distribute to get into standard form

2x^2 - 4x + x - 2 = 0

2x^2 - 3x - 2 = 0

a = 2, b= -3, c = -2

a is your answer

ok so what's the question?

step-by-step explanation:

triangle eg 7.5 × cos "a" or 7.5 × sin "b" or 6 tan"a"