1. Evaluate (x + 4)2 if x = 2 2. Evaluate x2 +6xy + 9y2 if x = 2 and y = 3

3. Evaluate 2a +2b, if = 2 and b = 3

4. Evaluate a + b +2c if x = 1, b = -2 and c =5

5. Evaluate 3x3-2y2 if x = 2 and y = 3

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?