Answer:
45
Step-by-step explanation:
0.45 x 
= 100
0.45 x 100 = 45
Answer: 63
Step-by-step explanation:
14.5x1.5=21.75
15x2.75=41.25
21.75+41.25=63
Answer: Smoothing constant
Step-by-step explanation:
Answer: Division Property of Equality
Step-by-step explanation: 20÷4=5
X=5
Yes, two pairs of congruent angles is enough information