Answer:
1, 2, 4
Step-by-step explanation:
The triangles are similar by AAA or SSS (yes)
The sides are proportional (yes)
The length of AB is 21, not 15 (no)
The length of BC is 9 (yes)
The dilation is an enlargement, not reduction (no)
Changing the subject of the formula
Answer:
b(a+c) this is answer okay
9.6 is your answer! (nine and six tenths)