Which of these is a function please answer.

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

Siri can type 90 words in 40 minutes about how many words would you expect her to type in 10 minutes at this rate

Bo is buying a board game that usually costs bb dollars. the game is on sale, and the price has been reduced by 18\%18%. which of the following expressions could represent how much bo pays for the game? choose 2 answers: choose 2 answers: (choice a) a 0.82b0.82b (choice b) b 1.18b1.18b (choice c) c b-0.18b−0.18 (choice d) d b-18b−18 (choice e) e b-0.18bb−0.18b