Need help on this
This is on angles and triangles

a) 4x + 76 = 180 (x = 26)

b)

- m<1  = 102

- m<2 = 78

Step-by-step explanation:

First we know 4x + 76 = 180. The reason for that is we know angle one plus angle two = 180 so 3x + 1x + 76 has to equal 180.

We can solve for x now.

4x + 76 = 180.

Subtract 76 to maintain equality on both sides.

4x = 104.

x = 26

Now we can get the angles.

For angle #1 let's substitute x as 26.

angle one = 26 + 76.

angle one = 102

For angle #2 let's substitute x as 26.

angle two = 3(26)

angle two = 78

Let's check!

78 + 102 = 180.

180 = 180 YES

Well, this took some time :)

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional