Which of the following are true statements about a variable? Select all that apply. A.) The number in front of a letter in an expression
B.) A Symbol used to represent an unknown value
C.) Can be changed from one value to another
D.) Always has to be the letter x

Thank you for whoever answers this! It’s pretty easy but this is for anyone out there who has the same question!

The answers are B ) A Symbol used to represent an unknown value and C ) Can be changed from one value to another

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations:

answer: (-6,3)

step-by-step explanation: