4. The three angles of a triangle measure x°, y° and 39°. Which of the following statements must be true? A. y=x+39
b. y+x=180-39
C. x+y=39
D. y=180-x

Which expression is equivalent to the expression shown?

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers

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?