I need help ASAP please.. Fill in the blanks.

△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 .

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?