I only know 23
6x-4 x=4-6=-10
4x+24 x=24-4=20
So! 20-(-10)=10 or 30 because you change the sign with this rule
if the sign are the same you keep change, change. which means keep 20 change - to + and change - to +, so then it becomes 20+(+10)
10% means for every 100 she spend 10
in 800 there are 8 100 thus she speds 80
or 10% to decimal form is

Answer:
2)
Step-by-step explanation:
You want to by two apples. Each apple costs three dollars. How much do you need to by two apples.