Could somebody help me out one these questions I'm not really good in math... :(

 1.) always

2. never

3. Square root of 65 is irrational. 3.5 and 19/20 are both rational. -6 is an integer.

4.  -10 and -11

5. 19

Explanation:

1. If a number can be expressed as a ratio of integers or as a fraction with an integer in the numerator and and a non-0 integer in the denominator, it is a rational number.

2. Natural numbers are the counting numbers, the whole numbers above 0

4. -√105 ≈ -10.24695077  

5. Thank goodness for calculators!

the equivalent expression are always the hardest ones but you look at the gcf also

step-by-step explanation:

r and t.

both are 64 degrees.