Please help fast I’d appreciate it! The slope of a line is 2. The line passes through (-1,K) and (4, 8) find the value of K. Please EXPLAIN Thx!!!

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles.

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?

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?