Can you check my answers and with number  3? 1. which expressions are polynomials? select each correct answer. a: 8x2(3^y) < b: 9x2(y/5) c: 3y2(x 1/4) d: 4x2(y^5)< 2. which description is correct for the polynomial 3x3+4x2−7? a: quartic trinomialb: cubic trinomialc: cubic binomial < d: quadratic trinomial3. what is the degree of the polynomial −6x3y2+5x4−7z? 4.simplify.(5x−2+3x2)+(4x+3)a: 3x2+x+5b: 12x4+1c: 3x2+9x−1 < d: 3x2+9x+15. simplify.(5x^2+2x−5)−(3x^2+3x+1)a: 2x^2−5x+4b: 2x^2+5x−4 < c: 2x^2−x−6d: 8x^2+5x−4

Question 1 :B,D.

Question 2:option B,

Question 3:Degree=5.

Question 4:option D.

Question 5: option c.

Step-by-step explanation:

1) A polynomial can not have any exponent as a variable or a fraction.

Options B and D are polynomials.

2) The polynomial is having 3 terms and is of degree 3.so it is a cubic trinomial Option B.

3) Degree is the highest power of the variables in the terms .The term has the power=3+2=5

So degree =5.

4)

Option D

5)

Simplifying like terms,

=

Option c.

  21.3

step-by-step explanation:

multiplying the given equation by c/sin(25°), we get

  c = 9/sin(25°) ≈ 21.2958 ≈ 21.3

we assume "c" is the length of ab, the side opposite angle c in triangle abc.

step-by-step explanation:

the answer is 128