Helpp me please (No Links Or Files For Explanations Or Solutions)

Thank you very much in advance for whom will help and for whom will answer my questions correctly.​​

Step-by-step explanation:

#7

A mathematical system includes axioms, postulates and theorems, defined and undefined terms.

Correct choice is

#8

We cannot define the undefined terms but we use term to define the others. As an example, we use point and line to define rays or segments.

Correct choice is

#9

Undefined terms are point, line and plane

Correct choice is

30.5*10=350$

you have to multiply the number without the decimal point then add it later but if its tenn u must move the place value of the decimal point 1 to the right.