For δabc, ∠a = 4x + 7, ∠b = 2x + 3, and ∠c = 6x - 10. if δabc undergoes a dilation by a scale factor of 2 to create δa'b'c' with ∠a' = 5x - 8, ∠b' = 3x - 12, and ∠c' = 7x - 25, which confirms that δabc∼δa'b'c by the aa criterion?
a) ∠a = ∠a' = 47° and ∠b = ∠b' = 23°
b) ∠a = ∠a' = 47° and ∠c = ∠c' = 50°
c) ∠b = ∠b' = 33° and ∠c = ∠c' = 80°
d) ∠b = ∠b' = 23° and ∠c = ∠c' = 45°

How do i do this activity, is appreciated

Which situation can be modeled by the inequality 5 + 10w ≥ 45? a. you start with $5 and save $10 a week until you have at least $45. b.you start with 5 baseball cards and purchase 10 cards every week until you have at most 45 cards. c.you start with 5 water bottles and purchases cases of 10 water bottles each until you have a total of 45 water bottles. d.you spend $5 plus $10 per week until you have less than $45.

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.