Answer:
A variable is a letter, for example x, y or z, that represents an unspecified number.
6+x=12
To evaluate an algebraic expression, you have to substitute a number for each variable and perform the arithmetic operations. In the example above, the variable x is equal to 6 since 6 + 6 = 12.
If we know the value of our variables, we can replace the variables with their values and then evaluate the expression.
Step-by-step explanation:
6z+4x=?
Solution: Replace x with 3 and z with 2 to evaluate the expression.
6z+4x=?
6⋅2+4⋅3=?
12+12=24
Hope this helps @(^_^)@
7,14,21,28,35,42 ......................
Shyam travel total 
distance ,when he travelled 
by bus and 
by car .
How to find the total distance travel by Shyam ?
Shyam travelled distance by bus 
Shyam travelled distance by car 
Total distance travelled by shyam is
Total distance= distance travelled by car + distance travelled by bus
Total distance
Learn more about the distance travel is here :
brainly.com/question/28048546
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