Marco can build a computer twice as fast as Cliff. Working together, it takes them 5 hours. How long would it have taken Marco working alone?

7.5 hours

Step-by-step explanation:

Let Marco's speed be M

Cliff's speed be C

M = 2C

Combined speed:

M + C

2C + C = 3C

3C = W/time

3C = W/5

W = 15C

2C = 15C/time

Time = 15/2 = 7.5 hours

paula, cory, and krista

to plot points   for x just start at the origin (middle) and go to the left however many times it say(if the number is a positive) if the number is a negative then go right however many times it says if it is 0 go nowhere

now keep you pencil there and go up however many times it says on y(if it is positive) if it is negative then go down however many times it says. if it says 0 go nowhere.

you have just plotted a point! now when you finish plotting all of them connect them with a ruler

plot each point as (-3, 7), (0,4), (3,1), (8,-4)   in the parenthesis on the left of the comma is x and the right is y.