A. -3(-1) + 7 = 4
3 + 7 = 4
11 = 4 (wrong)
B. 4x - 8 = 12
4(-1) - 8 = 12
-4 - 8 = 12
-12 = 12 (wrong)
C. -2x + 3 = 1
-2(-1) + 3 = 1
2 + 3 = 1
5 = 1 (wrong)
D. 8x + 5 = -3
8(-1) + 5 = -3
-8 + 5 = -3
-3 = -3 (correct!)
So, in conclusion, D is the correct answer.
Answer:
x = 20
Step-by-step explanation:
The consecutive angles in a parallelogram are supplementary, sum to 180°
5x + 4x = 180
9x = 180 ( divide both sides by 9 )
x = 20
In order for tan x = 0, sin x must be = 0
<span>sin x = 0 at 0 degrees and 180 degrees </span>
<span>so, tan x = 0 at 0, pi </span>
<span>as for the period being pi, you need to have tan x be negative and positive </span>
<span>so remember the acronym All students take calculus ( ASTC) for where they are positive. </span>
<span>tan x is negative in Quadrant II and positive in Quadrant I, since it just repeats after that, the period therefore must be Pi.</span>
