Answer:

Step-by-step explanation:
SSS Congruence Theorem apply to equilateral triangles because equilateral triangles have equal sides.

check your calculator on the factorial(!) button.
Please, proofread your problem statements before posting them. Your "If 1,600 people live 25% of the population how many people need to leave" should be written as "<span>If the whole population is 1,600 and 25% of them need to leave, how many must leave?"
0.25(1600) = 400
400 people need to leave. This is 25% of the entire population, or 25% of 1600 people. Please note: it's "leave," not "live."</span>