CPhill

D.   symmetry  

[ the left half and right half are "mirror " images ]

C.  phi   

[ However....the lowercase usually denotes the reciprocal of the  ratio...."Phi" usually denotes the ratio itself ]

3-4v =  -6v+11

Add 6v to both sides

3 + 2v = 11  

Subtract 3 from both sides

2v  =  8       

Divide both sides by 2

v =  4

(2/5) is the scale factor

a.   the ratio is just the scale factor  = 2/5  =  2 : 5

b. the ratio is   (scale factor)^2   =  (2/5)^2 =  4/25   =   4 : 25

c.  the ratio is   (scale factor)^3 =  (2/5)^3  = 8/125  =  8 : 125

One line of symmetry.......a vertical line "splitting" the A into mirror images

Here you go :

https://www.desmos.com/calculator/3mklloavnm

The triangle is isoceles......each of the smaller angles = 30°

To find the straight edge length we can use the Law of Sines

Edge Length / sin120°  = 60/ sin 30°

Edge Length  =   60*sin (120°) / sin 30°  = [60sqrt (3)/2] / (1/2)  = 60sqrt(3) cm   (1) 

For the curved part.....the perimeter is

(240/360) * 2 * pi * (60)  =

(4/3) * pi * 60  =

80 pi  cm    (2)

So....the perimeter is (1) + (2)   =

[ 60sqrt(3) + 80 pi ] cm ≈   355.25 cm

What do you want to do....graph this ???

log ₂ 16  + log ₂ 16   =   4 + 4  =  8

So

A. log ₂ 256  =  8

B.  8

C  . log  ₂ 2^8  =     8 log ₂ 2  = 8 * (1)  =  8

Parallel lines have the same slope

The slope of  r  is     [ -4 -1 ]   / [ -4 -6] = [ -5 ] / [-10] = 5/10  = 1/2

A (0,2) and (6, 5)

slope =   [ 5 - 2] / [ 6 - 0]  =  3/6  =  1/2     parallel

B(8,2) and (6, 5)

slope = [ 5 - 2] / [ 6 - 8 ] =   3/-2     =  -3/2   not parallel

C(2, 0) and (5,6)

slope  = [ 6 - 0 ] / [ 5 - 2]  =  6 / 3  =  2   not parallel

D(5,2) and (3, 0)

slope  = [ 0 - 2 ] / [ 3 - 5] = -2/-2  =  1   not parallel