elenarocky

you can use BODMAS which means(Bracket Of Division Multiplication Addition Subtraction)

2+3-9*7/8= (2+3)-(9*7/8)

•                    divide 7/8 first then multiply by 9
•                    add (2+3)
•                     then minus (2+3)-(9*7/8)= 5-(63/8)= -23/8
• Then you'll get the answer

3456

-1 can be written as -3/3

take -3/3 -5/3

=   -8/3  

x^2 + x^1=x^3

simply add the powers to get the answer

4 

because tom shared 4 apples with sam