Help plz image

Simplify the expression and find the missing terms. the simplest form of has in the numerator and in the denominator.

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days

Lin is writing an equation to model the proportional relationship between y, the total cost in dollars of downloading videos from a website, and x, the number of videos downloaded. she knows that the total cost to download 3 videos was $12. her work to find the equation is shown below. joylin’s work step 1 k= 3/12= 0.25 step 2 y= 0.25x where did joylin make her first error?