Answer:
A is the answer because volume of a cube is v = a^3

Use proportions set up as hotdogs to minutes, then cross multiple 21×m =21m and 6×35 =210 divide by 21 gives you 10 minutes. It would take Mika 10 minutes to eat 35 hot dogs.
In statistics, it is imperative to arrange your data entries from least to greatest. That would be the first step of our solution
3 6 7 9 10 12 13
Interquartile range is the difference of the last quartile to the first quartile. Divide your entire data set into four parts. Each division is called a quartile. Its numerical value is the average of its numbers. However, since our data set contains 7 numbers, which is odd, we write the median (middle value) twice. The quartiles are:
3 6 | 7 9 | 9 10 | 12 13
Q₁= (3+6)/2 = 4.5
Q₂ = (7+9)/2 = 8
Q₃ = (9+10)/2 = 9.5
Q₄ = (12+13)/2 = 12.5
The interquatile range is Q₄ - Q₁ = 12.5 - 4.5 = 8
Answer:
1a: f(-2) means substituting -2 for x
1b: 65
I don't know the second one