Plzzz will give brainlest only if correct part a: the sun produces 3.9 ⋅ 10^33 ergs of radiant energy per second. how many ergs of radiant energy does the sun produce in 3.25 ⋅ 10^3 seconds? part b: which is the more reasonable measurement of the distance between the tracks on a railroad: 1.435 ⋅ 10^−3 mm or 1.435 ⋅ 10^3 mm? justify your answer.

Part a

power = 3.9 \times  {10}^{33} erg \:  {sec}^{ - 1}  

energy \: in \: 3.25 \times  {10}^{3} sec = 3.9 \times  {10}^{33}  \times 3.25 \times  {10}^{3}  = 12.675 \times  {10}^{36}  

part b  

1.435 . 10^3 mm = 1.4m

1.435 . 10^-3 mm = 0.001435m  

so the first one ie 1.4m is more reasonable as tge second one is too small quantity.

Hope it helps.

it's d.

step-by-step explanation:

because: -1(4x + 1y) +2 (1x-3y) distribute each number into the parenthesis.

then you would get: -4x - 1y + 2x -6y combine like terms

and get: 2x -7y

hope my answer has you if not then i'm sorry.

the anwser is d) 75°

step-by-step explanation: