What is the sum or difference?

1. 2x^4 - 8x^4

(a). -6x^8
(b). -6x^4
(c). -16x^4
(d). -16x^8

what is the sum or difference?

2. 6y^5 - 9y^5

(a). -3y^10
(b). 15y^5
(c). -54y^5
(d). -3y^5

3. write the polynomial in standard form. then name the polynomial based on its degree and number of terms.

6 - 12x + 13x^2 - 4x^2

(a). 9x^2 - 12x; quadratic binomial
(b). 9x^2 - 12x + 6; quadratic trinomial
(c). -3x^2 + 6; quadratic binomial
(d). 9x^2 - 12x - 6; cubic trinomial

4. a biologist studied the populations of common guppies and endler's guppies over a 6-year period. the biologist modeled the populations, in ten of thousands, with the following polynomials where x is time, in years.

common guppies: 3.1x^2 + 6x + 0.3
endler's guppies: 4.2x^2 - 5.2x + 1

what polynomial models the total number of common and endler's guppies?

(a). 7.3x^2 + 0.8x + 0.7
(b). 7.3x^2 - 0.8x + 1.3
(c). 7.3x^2 + 0.8x + 1.3
(d). 7.3x^2 + 0.8x - 1.3

5. a family is building a circular fountain in the backyard. the yard is rectangular and measures 14x by 19x and the fountain is going to be circular with a radius of 6x. once the fountain is built, what will be the area of the remaining yard?

(a). 230πx^2
(b). 230x^2
(c). 266x^2 - 6πx^2
(d). 2x^2(133 - 18π)

6. a sports team is building a new stadium on a rectangular lot of land. if the lot measures 6x by 10x and the sports field will be 1x by 4x, how much of the lot will be left over to build bleachers on?

(a). 56x^2
(b). 64x^2
(c). 30x^2
(d). 60x^2

can someone this is lesson 9, unit 3, polynomials and