Answer:
1.9 × 10^-6.
Step-by-step explanation:
4) 121 degrees
because if x is 121 degrees then angle BCA will equal 59 degrees (the two angles must equal 180) so using the sum of a triangle's angles, then angle BAC will have to equal 59, making the triangle an isoceles, which will make AB to be congruent to BC.
Let "x" be the mystery number
A product of 4 and this number = 4x
Six less that that = subtracting six from 4x
So the final equation is
4x-6=5
P.S.: x = 2.75