CAN ANYONE MAKE SURE THESE ARE RIGHT?

Find the equation of the line for each situation.
A line with a y - intercept of 4 and a slope of -1
Y=-1x+4
A line passing through the point (3, 4) and having a slope of -2
Y=-2x+3
A line passing through the points (1, -1) and (9, 3)
Y=1x+9

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =

Me its important ! marge runs an ice cream parlor. her speciality is triple chocolate sundaes.she can prepare 1 sundae every 2 minutes, and she earns $1.20 for each sundae she makes . if she just makes sundaes for a single shift of at most 4 hours and at least 2 hours , which function relates her earnings to the number of minutes she works?

Amayoral candidate would like to know her residents’ views on a public open space before the mayoral debates. she asks only the people in her office. her co-workers are an example of a census population convenience sample simple random sample