PLS HELP
Which of the following numbers is irrational?

-0.3

Three times the sum of a number and seven is negative thirty-six. what is the number?

Acircle has a circumference of 28.36 units what is the diameter of the circle

Factor the polynomial 4x4 – 20x2 – 3x2 + 15 by grouping. what is the resulting expression? (4x2 + 3)(x2 – 5) (4x2 – 3)(x2 – 5) (4x2 – 5)(x2 + 3) (4x2 + 5)(x2 – 3)