Answer:
-49
Step-by-step explanation:
it would be this because first we would have to figure out what 6*10 is that why we know what to distribute . so once we figure it out , which is 70 . We would then subtract 14 from 70 . Since 7 is right next to 2 we would then multiply it to get to 14. Once we get that you should get 56, from there you would subtract 56 to 105 , and get your answer.
Isn’t it choice B …….…………
D means common difference which is the last term minus second last term .
and u can use this formula only if there is a common difference.
I’m pretty sure the answer is C
7x2.2 is 14.4 then you will need to multiply 3x2.2 then add them up
