Will mark brainlest I need help ASAP with both questions

Prove that 3: 8 is equivalent to 12: 32.a. use diagrams to support your answer.

Arectangular garden is 5 feet long and 3 feet wide. a second rectangular garden has dimensions that are double the dimensions of the first garden. what is the percent of change in perimeter from the first garden to the second garden?

Find a third-degree polynomial equation with rational coefficients that has roots -2 and 6+i