We have 2 angles that are supplementary, so their sum equals 180⁰.
(4x - 10) + (7x - 8) =180
11x - 18 = 180
11x = 198
x = 18
See the picture above for the solution.
Step-by-step explanation:



Now subtract.....

hence the answer is 3 ....
hope it helped !!!!
3, 9, 27, 81, 343, 729, … is a geometric sequence because each term is obtained by multiplying 3 to the preceding term.