The setup looks like this:
0.4(10) + 4x = 0.3(14)
the 14 is the total amount of acid added.
4 + 4x = 4.2
4x = 0.2
x = 0.05 or 5 % acid solution
The area was originally 3*5, or 15 cm^2.
When the sides were enlarged, they were all multiplied by 3. The new sides are 3*3, or 9, and 5*3, or 15.
The new area is 9*15, or 135 cm^2.
If you divide 135, the new area, by 15, the original area, you get 9. So, the area increased by a factor of 9.
Y=3.4x
2*3.4=6.8
5*3.4=17
8*3.4=27.2
11*3.4=37.4
The coefficients are the numbers next to the variable.
11r :- The coefficient is 11
7s :- The coefficient is 7
