Which value is a solution of (7)/(4)x^(2)-2=-0.5x+4? A. x=-2 B. x=-1 C. x=1 D. x=5

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?

Pls brainliest will be awarded if answer is correct

Find the nonpermissible replacement for binthis expression.b2/5b +5