36! goodluck hope it good
Answer:
B
Step-by-step explanation:
1. Given mathematical statement

So,

2. Rewrite it as

So,

3. Combine like terms
and 

So,

4. Add
to both sides:

So,

5. Subtract 3 from both sides:

So,

6. Divide both sides by 5:

So,

7 because 42 divided by 6= 7 and length times width = perimeter
Answer:
35-=13 boxes ; 65-9 boxes
Step-by-step explanation:
35 x X+ 65 (22-x)=1040
35x+1430-65x=1040
1430-30x=1040
30x=390
x =390/30=13