Plz , i really need can't fail

to which real number subset do the following real numbers belong?

{4}{5},\; -6,\; 3.9

a.
integers
b.
irrational numbers
c.
rational numbers
d.
natural numbers

Aladder that is 30 ft long needs to reach 27 ft up a building. what should the angle of the vertical be?

Write an expression that has three terms and simplifies to 4x - 7. identify the coefficient(s) and constant(s) in your expression

Prove the divisibility of the following numbers: 25^9 + 5^7 is divisible by 30.also, read as (25 to the power of 9) + (5 to the power of 7) is divisible by 30. blank x 30what is the blank? ( it should be expressed in exponent form)