Find the height of the cylinder

Answer choices:
A) 11.041 ft
B)51.340
C)102.681
D)34.686

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

What are the excluded values? m+5/mn+3m

Answer asap and if you do you will get brainliest. catherine buys a gallon of ice cream from the store. after taking it home, she eats a fifth of a gallon of ice cream. her sister eats some of the ice cream as well. if two-thirds of the original amount of ice cream is left, then what fraction of a gallon of ice cream did her sister eat?