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Will mark brainilest

Ataxi company charges $2.25 for the first mile and then $0.20 per mile for each additional mile, or f = $2.25 + $0.20(m - 1) where f is the fare and m is the number of miles. if juan's taxi fare was $6.05, how many miles did he travel in the taxi? if juan's taxi fare was 7.65, how many miles did he travel in taxi

What is the number 321,000,000 in scientific notation? also what is the number? ?

Solve the equation. 2x - 8(x+1)= 6(2x - 3)