Shawty's like a melody in my head That I can't keep out, got me singin' like Na na na na everyday It's like my iPod's stuck on replay Replay-ay-ay-ay Shawty's like a melody in my head That I can't keep out, got me singin' like Na na na na everyday It's like my iPod's stuck on replay Replay Remember the first time we met You was at the mall wit yo friend I was scared to approach ya But then you came closer Hopin' you would give me a chance Who would have ever knew That we would ever be more than friends We're real worldwide, breakin' all the rules She like a song played again and again That girl, like something off a poster That girl, is a dime they say That girl, is a gun to my holster She's running through my mind all day, ay Shawty's like a melody in my head That I can't keep out, got me singin' like Na na na na everyday It's like my iPod's stuck on replay Replay-ay-ay-ay Shawty's like a melody in my head That I can't keep out, got me singin' like Na na na na everyday It's like my iPod's stuck on replay Replay-ay-ay-ay See you been all around the globe Not once did you leave my mind We talk on the phone, from night 'til the morn' Girl, you really changed my life Doin' things I never do I'm in the kitchen cookin' things she likes We're real worldwide, breakin' all the rules Someday I wanna make you my wife That girl, like something off a poster That girl, is a dime they say (Hey) That girl, is a gun to my holster She's running through my mind all day, ay Shawty's like a melody in my head That I can't keep out, got me singin' like Na na na na everyday It's like my iPod's stuck on replay Replay-ay-ay-ay Shawty's like a melody in my head That I can't keep out, got me singin' like Na na na na everyday It's like my iPod's stuck on replay Replay-ay-ay-ay I can be your melody Oh, girl, I could write you a symphony The one that could fill your fantasies So come baby girl let's sing with me, ay I can be your melody Oh, girl, I could write you a symphony The one that could fill your fantasies So come baby girl let's sing with me, ay Na na na na na na na Na na na na na na Shawty got me singin' Na na na na na na na Na na na na na na Now she got me singin'
If the rate of change is -8, subtract 8 from your y value of 27. And if 19 is correct, you should be able to subtract 8, and get 11 as the next number in the function, which you do, so 19 is the value of a.
