answers for math

X, Y and Z can finish a work in 10, 20 and 30 days respectively. After working together for 5 days X left the work and Z also left the work 5 days before the work was complected then in how many days was the work completed?

The scale factor for the blueprint of a house is 1 cm to 4cm. If the blueprint of the dining room is 1 cm by 1.25 cm, what are the actual dimensions of the dining room ?

I need help on middle school questions and I need the answerers fast and the book is holt middle school course 1 page 154 1-58

(-7,2) (3,-3)can someone write an equation for this? If you can thank you mucho!=P:D

I bet nobody knows this problem Y=x-2 Y=4x+1