What is lenght of the arc of this sector plsss help and show working and answer

Janet is mixing a 15% glucose solution with a 35% glucose solution. this mixture produces 35 liters of a 19% glucose solution. how many liters of the 15% solution is januet using in the mixture? a. 25 liters c. 28 liters b. 7 liters d. 10 liters

Will mark brainliest. when ∆rst is translated 4 units down, what are the apparent coordinates of t’?

Can someone answer this question? : )