Answer:

Step-by-step explanation:

Answer:
i am sorry i cant see the picture
Step-by-step explanation:
Answer:
2/21
Step-by-step explanation:
17/21 -(3/7 + 2/7)
First you add
=17/21 - (5/7)
Then you want to subtract
=2/21
If it's -4+8, -4 is 4 less than 0. 8 is 8 more than 0, also 4+4. so -4+4 would be zero, then there's 4 more and 0+4 is 4
I think it is 90. I hope this helpsb