i need help on these 3 questions

1. The amounts of food waste generated in a region during two years were 37,500,000 tons and 30,400,000 tons. What was the total food waste generated over these two years in the region, expressed in scientific notation?

67.9 ⋅ 10^14 tons
6.79 ⋅ 10^7 tons
67.9 ⋅ 10^7 tons
6.79 ⋅ 10^14 tons

2. What is p−m ÷ pn equal to?

p−m + n
p−m ⋅ n
p−m − n
p−m ÷ n

3. Which rational number equals 0 point 1 with bar over 1?

1 over 11
1 over 10
1 over 9
1 over 8

Question

i need help on these 3 questions
 
1. The amounts of food waste generated in a region during two years were 37,500,000 tons and 30,400,000 tons. What was the total food waste generated over these two years in the region, expressed in scientific notation?

 67.9 ⋅ 10^14 tons
 6.79 ⋅ 10^7 tons
 67.9 ⋅ 10^7 tons
 6.79 ⋅ 10^14 tons

 2. What is p−m ÷ pn equal to?

 p−m + n
 p−m ⋅ n
 p−m − n
 p−m ÷ n

3.  Which rational number equals 0 point 1 with bar over 1?

 1 over 11
 1 over 10
 1 over 9
 1 over 8