Answer:
The letter "x" is often used in algebra to mean a value that is not yet known. It is called a "variable" or sometimes an "unknown". In x + 2 = 7, x is a variable, but we can work out its value if we try! A variable doesn't have to be "x", it could be "y", "w" or any letter, name or symbol.
Step-by-step explanation:
Answer:
a = 8
Step-by-step explanation:
4 : 3 = a : 6

Cross multiply
4*6 = a * 3

a = 4 * 2
a = 8
8÷2/7
8/1÷2/7
8/1*7/2
56/2
28
Hope this helps :)
Answer:
3. 1/2 4. 13/20
Step-by-step explanation:
Those are the only one I know, sorry :/