You can pick a question to answer. you don't have to do all of them. plz plz leave a explanation of how you did it. im struggling

You follow the Order of Operations:
P - parenthesis
E - exponents
M - multiplication
D - division
A - addition
S - subtraction

Take #3 for example:

10-18÷3+1

No parenthesis, no exponents, no multiplication, but there's division! -18÷3, which equals -6.
So, now the newly written equation is:
10-6+1
Next, there's addition. -6+1, which equals -5.
Newly written equation:
10-5
Finally, there's subtraction.
10-5=5
So, the answer is 5.