An algebraic expression
No they do not, equations have equal signs.
A mathematical sentence is a math problem without an equal sign, broken down on step at a time.
It is a statement that two numbers are NOT equal.
An equation is equal if you have a math problem on each side of an equal sign.
depends on the math problem
an equation.
This appears to be more of a grammar problem than a math problem.
You do it wrong. With out order of operations, the same math problem could have several different answers. In math, there is only one answer.
Where instead of an equal sign, it might be greater than or less than signs.
a collection of symbols that jointly express a quantity
7.24 times seven will equal 50.78. This is a math problem.