Question

Someone answer and explain this for me please​

Answer 1

Answer:

which one

Step-by-step explanation:

Answer 2

Step-by-step explanation:

To find : Write a variable expression the algebraic expression ?

Solution :

A variable is defined as the symbol for a number we don't know yet.

It is usually a letter like x or y.

1) $3x+7$

The variable in the expression is unknown value i.e. x.

2) $x-9$

The variable in the expression is unknown value i.e. x.

3) $x^2-2x$

The variable in the expression is unknown value i.e. x.

4) $\frac{a}{2b}$

The variable in the expression is unknown value i.e. 'a' and 'b'.