Answer:
a=6 b=12
Step-by-step explanation:
i think i could be wrong
3x-x+2=12
2x+2=12
2x = 10
x=5
C
A is wrong because 10 is not prime
B is wrong because still above^^
D is wrong because diagonals of a rhombus are not congruent.
So C is correct
289.9 or
1147 / 4