Find the value of cos C

Medium sodas cost $1.25 and hot dogs cost $2.50. natalie’s group brought in pizzas but is buying the drinks at concession stand. how many medium sodas can natalie’s group buy with $20? make a table to show answer.

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

True or false look at the picture pls : /