Answer:
the first option : multiply by 2 and add 3
Step-by-step explanation:
check
2 × 2 + 3 = 4 + 3 = 7
7 × 2 + 3 = 14 + 3 = 17
17 × 2 + 3 = 34 + 3 = 37
correct
the other options don't work :
2 × 3 + 2 = 6 + 2 = 8 wrong. we need 7.
2 × 10 = 20 wrong. we need 7.
2 × 2 + 10 = 4 + 10 = 14 wrong. we need 7.
