Answer:
237 students graduated
Step-by-step explanation:
Subtract 172 from 409, obtaining 237.
237 students graduated
Answer:
3.
Step-by-step explanation:
Note the prime factorization of 120,

Therefore, there are 3 distinct prime factors, namely 2, 3 and 5.
Answer:
x = ±2√10
Step-by-step explanation:
40 - x² = 0
⇌
(√40 - x)(√40 + x) = 0
⇌
x = √40 or x = -√40
we can go further and say that √40 = 2√10