Question

a=12(390)8 , b=7(134)5 ,c=( ? )12 options 1-299 ,2-289 ,3-271 ,4-280 please explain this answer.​

Answer 1

Correct answer is -

279

12+8=20

(20^2)-10=390

7+5=12

(12^2)-10=134

5+12=17

(17^2)-10=289–10=279

Step-by-step explanation:

a=12(390)8⇒12+8=20a=12(390)8⇒12+8=20

20×20−10=39020×20−10=390

b=7(134)5⇒7+5=12b=7(134)5⇒7+5=12

12×12−10=13412×12−10=134

c=5(?)12⇒5+12=17c=5(?)12⇒5+12=17

17×17−10=27917×17−10=279.

Answer 2

Answer:

marks as brainlist first