Answer:
7
Step-by-step explanation:
because 10 x 5 +50 and when u subtract that from 864 there 814 left and 800 can be divided by 10. Therefore 14/ 2 =7 idk if this is right tho
that's alot of questions
18
-2(3x+4)+7x=10
-6x-8+7x=10
x=10+8
x=18
69