Use pemdas to solve:
Parenthesis (5-3)
Exponent 4^2
Multiply 6•2
Divide
Add 16+2+12
Subtract
4^2 + (5-3) + 6•2
4^2 + 2 + 6•2
16 + 2 + 6•2
16 + 2 + 12
30
4th answer because the ratios are not the same. The ratios need to be the same. 1:2 and 2:4 ratio is the same because the fraction 1/2 is the same as 2/4. So, 3:4 ratio is the same as 9:12 because 3/4 is the same as 9/12. However 7:4 ratio or 7/4 is not the same as 4/3. So they are not similar.
Answer:
I attached the image that has all of the elements. If I missed something, please let me know and I will fix it.
1/10 + 1/10 = 2/10
10 / 5 = 2
3/5 = 6/10
2/10 + 6/10 = 8/10
10/10 - 8/10= 2/10