Yeah Im pretty sure it is
Solution:
Let the bottle of sunscreen cost be $x. Then we can write
($x+ $6.50)+6%($x+ $6.50)=$16.43
Now solve this for x as below


Hence the bottle of sunscreen cost $9.
Answer:
Final answer is
or
.
Step-by-step explanation:
Given equation is 
Now we need to solve that equation for x.

Apply formula 

Apply formula 






or 
or 
or 
Hence final answer is
or
.
The required expression is 100 - 0.2w
Step-by-step explanation:
Given,
Amount of radioactive substance = 100 mg
The substance decreases by 20% each week.
To find the remaining amount of the in w weeks.
Now,
Each week 20% = 0.2 of the substance will be decreased.
So, in w weeks 0.2×w of the the substance will be decreased.
Hence,
The remaining substance = 100 - 0.2w
1)y=3x
2)y=x
3)y=7x
4)y=x+7
4)y=2x+1
6)y=12x+2