Attached the solution and work.
Answer:
-2
Step-by-step explanation:
7−5+3−1
using BODMAS
A is addition and it comes before subtraction
7−(5+3)−1
7-8-1
then solve
7 - 9 = -2
If nine plus 10 is 21 and the square root of the sun is blank
It's the last one. .........