NEED HELP

Find the perimeter and area of this parallelogram. Show your work. Dimensions are in centimeters.

7x+8y=-18, 4x-9y=-3 solve the system of equations

What is the definition of exponential decay?

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?