What is the sum?

Question

3 x superscript 8 baseline plus 7 x superscript 8 baseline

(1 point)
Responses

10 x superscript 16 baseline
Image with alt text: 10 x superscript 16 baseline

21 x superscript 8 baseline
Image with alt text: 21 x superscript 8 baseline

10 x superscript 8 baseline
Image with alt text: 10 x superscript 8 baseline

negative 4 x superscript 8 baseline
Image with alt text: negative 4 x superscript 8 baseline

Answer 1

10 x superscript 8 baseline

Answer 2

What is the sum or difference?
10y10 – 14y10
(1 point)
Responses

–4y20
–4 y 20

–140y20
–140 y 20

–140y10
–140 y 10

–4y10
–4 y 10

Answer 3

-4y10

Answer 4

Write the polynomial in standard form. Then name the polynomial based on its degree and number of terms.

2 – 11x2 – 8x + 6x2
(1 point)
Responses

–5x2 – 8x + 2; quadratic trinomial
–5 x 2 – 8 x + 2; quadratic trinomial

–5x2 – 8x; quadratic binomial
–5 x 2 – 8 x ; quadratic binomial

–6x2 – 8x – 2; cubic polynomial
–6 x 2 – 8 x – 2; cubic polynomial

6x2 – 8x + 2; cubic trinomial

Answer 5

-5x2 - 8x + 2; quadratic trinomial

Answer 6

A biologist studied the populations of common guppies and Endler’s guppies over a 6-year period. The biologist modeled the populations, in tens of thousands, with the following polynomials where x is time, in years.

common guppies: 3.1x2 + 6x + 0.3

Endler’s guppies: 4.2x2 – 5.2x + 1

What polynomial models the total number of common and Endler’s guppies?
(1 point)
Responses

7.3x2 + 0.8x + 0.7
7.3 x 2 + 0.8 x + 0.7

7.3x2 – 0.8x + 1.3
7.3 x 2 – 0.8 x + 1.3

7.3x2 + 0.8x + 1.3
7.3 x 2 + 0.8 x + 1.3

7.3x2 + 0.8x – 1.3

Answer 7

7.3x2 + 0.8x + 1.3

Answer 8

A sports team is building a new stadium on a rectangular lot of land. The lot measures 8x by 12x and the stadium will be 3x by 6x. How much land will be left for the parking lot?
(1 point)
Responses

78 x squared
Image with alt text: 78 x squared

114 x squared
Image with alt text: 114 x squared

96 x squared
Image with alt text: 96 x squared

30 x squared

Answer 9

30 x squared