Need help on this one pls

The value of x is 18°.

Step-by-step explanation:

If I remember correctly, I believe the sum of opposite angles 89° and 51° are also the sum of the angles (5x - 8)° and (3x + 4)°. So, going off that..

If 89° + 51° = 140°; then (5x - 8)° + (3x + 4)° = 140.

(5x - 8)° + (3x + 4)° = 140

8x - 4 = 140°                               Combine like terms

   + 4   +   4                                Add 4 to both sides

8x = 144

8        8                                       Divide both sides by 8

x = 18°

Hope this helps,

~ Nicki ~

just do 5.2 + 2 ( 7.2) and 1/3 x 3 (.9) and youv'e got your equation. 0.9( 9/10) + 7.2 ^2 = 16.4 hope i could !

step-by-step explanation:

no ,sorry if you needed it but you can ask and try to see if any one will anwser ,

step-by-step explanation:

by good luck mark me as brainliest

have a nice day