PLEASE HELP ME!!

If AABC = ADEC,
B = 2x + 31 and E = 7x - 24

x= [?]

4. find the geometric mean of 4 and 12. 24 8

(05.08a)triangle abc is transformed to similar triangle a′b′c′ below: a coordinate plane is shown. triangle abc has vertices a at 2 comma 6, b at 2 comma 4, and c at 4 comma 4. triangle a prime b prime c prime has vertices a prime at 1 comma 3, b prime at 1 comma 2, and c prime at 2 comma 2. what is the scale factor of dilation? 1 over 2 1 over 3 1 over 4 1 over 5

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?