Answer:
19
Step-by-step explanation:
5² - (2.1 + 7.4) + 3.5
2.1 + 7.4 = 9.5
5² - 9.5 + 3.5
5² = 25
25 - 9.5 + 3.5
25 - 9.5 = 15.5
15.5 + 3.5 = 19
Hope this helped.