Kim earns $30 for babysitting on Friday nights. She makes an average of $1.25 in tips per hour. Write the function of Kim's earnings, and solve for how much she would make after 3 hours.

y = 1.25x + 30; $33.75

y = 30x + 1.25; $43.75

y = 30x + 1.25; $91.25

y = 1.25x + 30; $31.25

Question

Kim earns $30 for babysitting on Friday nights. She makes an average of $1.25 in tips per hour. Write the function of Kim's earnings, and solve for how much she would make after 3 hours. 

 y = 1.25x + 30; $33.75 

 y = 30x + 1.25; $43.75 

 y = 30x + 1.25; $91.25 

 y = 1.25x + 30; $31.25

neer2890 · Answer

Kim earns $30 for babysitting on Friday nights.
so if she's doesn't get any tip then also at the end of night, she has $30.
but she earns $1.25 per hour.
Let x is the number of hours Kim got tips.
so total earnings of Kim in x hours =1.25*x 
Total earnings of x hours and babysitting= 1.25x+30

so, in 3 hours, total earnings of Kim = 1.25*3+30= $33.75