Ok, I need Help with this I am going CRAZY... ({ Note: It's Very hard })

NO G-o-o-g-l-e Please

Thanks,
Me :P

20 da is equal to a. 2,000 cm. b. 2 m. c. 20,000 cm. d. 20,000 mm

How do i do this activity, is appreciated

Two corresponding sides of two similar triangles are 3cm and 5cm. the area of the first triangle is 12cm^2. what is the area of the second triangle?