the perimeter of a rectangle is 50 cm and the length is 4 cm longer than the width. write and solve the system of equations using the substitution method.
a. width = 10 cm, length= 14 cm
b. width = 10 1/2 cm, length= 14 1/2 cm
c. width = 11 cm, length= 15 cm
d. width = 23 cm, length= 27 cm

Define multiplicative inverse. give an example of a number and its multiplicative inverse.

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?

Can some one explain how to slove specifically, what is the value of x? 0.9(x+1.4)-2.3+0.1x=1.6 enter the answer as a decimal in the box. x= ?