10 POINTS A QUESTION!
PLEASE HELP! I NEED THIS ANSWERED, BOTH PICTURES 2 ON EACH PICTURE FOR A TOTAL OF 4, PLEASE HELP ME! I NEED TO TURN THIS IN TONIGHT!
(If you know these 4, I'm gonna ask another question just like it, in a minute.)

PLEASE HELP ME!
(I'm trying this again, as I only put one photo last time.)

For the first triangle the sum of angles in any given triangle is equal to 180 degrees.

The equation for the first triangle would be: 60+80+x+51= 180

Solving it we get: 191+x=180
x=-11.

The second triangle’s equation is: 90+45+52+x= 180

Solving it we get: 187+x=180
x=-7

The third triangle’s equation is: 4+7x= 90
This is because it is a right angle.

Solving it we get: 12.2 (rounding)
x=about 12.2

For the fourth triangle the equation is: 6x-5+5x=105 (we subtract 75 to 180 to get the sum of the other two angles)

Solving it we get: 11x=110
x=10.

Hope this helps! ( and if you can please give brainliest, it would mean a lot!)

I'm not sure but i think it's 1670km/h