PLEASE HELP WITH STEPS ANSWER IN SCIENTIFIC NOTATION I WILL GIVE BRIANLIEST

C.)   8.68686 ×

D.)   4.1688 ×

Step-by-step explanation:

For C.)  you take 8.69 and multiply that by and you'll get 86900000

Then you take 3.14 and multiply that by and you'll get 31400

So then you take 86900000 and 31400 and subtract it...

86900000 - 31400 = 86868600 and you convert 86868600 to scientific Notation.

Which would equal **** 8.68686 × *****

For D.) you take 4.32 and multiply that by and You'll get 4320

then you take 9.65 and multiply that by and you'll get 0.0965

So then you take 4320 and 0.0965 and subtract it...

4320 - 0.0965 = 4319.9035 and you convert 4319.9035 to Scientific Notation.

Which would equal **** 4.1688 × ****

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180