All of the angles in an octagon add up to 810 degrees If you want to know what one of the angles equals you do 810 divided by 6 to get 135 Another contributor's answer: An octagon is an eight sided polygon. Interior angles total 1080 degrees.
:)
Answer:
(1,2)
Step-by-step explanation:
Substitution:
x + 2y = 5 Solve for x
x = -2y + 5 Substitute -2y + 5 in for x in the second equation
4x - 12y = -20
4(-2y + 5) - 12y = -20 Distribute the 4
-8y + 20 - 12 y = -20 Combine the y term
-20y + 20 = -20 Subtract 20 from both sides
-20y = -40 Divide both sides by -20
y = 2
Plug y into either of the 2 original equations to get x.
x + 2y = 5
x + 2(2) = 5
x + 4 = 5
x = 1
The answer is (2,1).
Elimination:
x + 2y = 5 4x - 12y = -20. We want to eliminate with the x or the y. I am going to eliminate the x's that means that I have to multiply the first equation all the way through by -4
(-4)(x + 2y) = (5) (-4) That makes the equivalent expression
-4x - 8y = -20 I will add that to 4x - 12y = -20
<u>4x - 12y = -20</u>
0x -20y = -40
-20y = -40
y = 2. Plug 2 into either the 2 original equation to find x. This time I will select the second original equation to find x.
4x -12y = -20
4x - 12(2) = -20
4x - 24 = -20
4x = 4
x = 1
Answer:
D. x>5
Step-by-step explanation:
First one has a general upward trend that will be a non-zero correlation
Second one shows a zero average slope, no upward or downward tendency; NO CORRELATION
Third one has no slope, so NO CORRELATION
Fourth one, pronounced downward slope, strong negative correlation.
Fifth one, hard to tell but looks like no upward or downward average slope, so NO CORRELATION
=-8y-12=52
+12 +12
-8/-8y=64/-8
y=-8
