3(-2a-4)+3a what would this be i have so many questions today to ask y'all

Karen is financing $291,875 to purchase a house. she obtained a 15/5 balloon mortgage at 5.35%. what will her balloon payment be? a. $220,089.34 b. $219,112.46 c. $246,181.39 d. $230,834.98

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?