Answer:
3.2 because 16 divided by 5 is 3.2
Sorry my handwriting is so bad!!
Answer:

Step-by-step explanation:


First one has one solution
Second has infinite solutions
Third has no solutions.
Answer:
22.5
Step-by-step explanation:
0.80x=10 divide each side by 0.80
x=12.5 ml-----------------amount of pure acid needed
CK
12.5+10=0.20(100+12.5)=0.20(112.5)
22.5=22.5
Hope this helps