Priscilla wants to replace the brick border around her rectangular swimming pool. The area of the pool is 3x^2 + 5x − 2. The total area of the brick and pool is 6x^2 − 21. How many square feet of brick does Priscilla need? (polynomials)

Ten times the square of a non-zero number is eqaul to ninety times the number

Hi, can anyone show me how to do this problem? 100 points for this. in advance

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?