What is the volume of the rectangular prism?

Help me please :))

△cde maps to △stu with the transformations (x, y) arrowright (x − 2, y − 2) arrowright (3x, 3y) arrowright (x, −y). if cd = a + 1, de = 2a − 1, st = 2b + 3 and tu = b + 6, find the values of a and b. the value of a is and the value of b is .

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

Solve 3x-18=2y and 5x-6y=6 by elimination show work