42.081 * 99.91 ≈ 42 * 100 ≈ 4200
<span>C) 4200</span>
X^2 - 4x + 4 = 6x - 4 because:
-4x and 2x
4x + 2x = 6x so x^2 = 6x and 6 ^ 2 = 36
X = 6
User a ruler or a something ion know BAHA
2x + 3= -4
take the three away and take it away from the -4 ( you do this to get rid off the the =3 , what you do to one side you have to do to the other side )
2x = -7
now divide -7 by 2 to get the value of x
-7/2 = -3.5
so x= -3.5
as for the other equation :
now you need to substitute x = -3.5 into 5x + 2y = 1 to find y .
so you should have (5 x -3.5 ) + 2y =1 .
Calculate what's in the brackets , you should have -17.5 + 2y = 1
Now to get rid of the -17.5 add 17.5 to both sides of the = sign, you should now have 2y = 18.5 .
divide both sides by 2 to find the value of y , so you should have y = 9.25 .
To make sure you have the correct values , substitute both values into 5x+2y to see whether the answer will be 1 . (If it is , your values are correct , if not then go back over what you did and see whether you followed the steps correctly .)
(5x-3.5) + (2x 9.25 )
= -17.5 + 18.5
=1
I hope that was helpful !
Good luck :)
9514 1404 393
Answer:
regular octagon
Step-by-step explanation:
In order for a shape to tessellate a plane, there must be a way to arrange the shapes so that the sum of angles at a node is 360°. An arrangement of kites is shown in the attachment. Of course, squares are used to tile planes all the time, as their four 90° corners fit together nicely.
An octagon has internal angles of 135°, which is not a sub-multiple of 360°. Hence there is no way for octagons to fit together to tile a plane.
Octagons will not tessellate a plane.