Simplify each expression. 1. 3x + 2(5x - 7) 2. 9 - 3(2x - 4) 3. 8x - 6(3 - 2x) 4. -5 + 5(x + 4) 5. 4 (6n + 9) - 10n 6. 14 - 3(4n - 1) 7. -8n + 8(4 + 2n) 8. 7k - 2(3k + 1) - 9 9. k + 1 - 4(2k - 9) 10. -6 + 5(8 - k) - 8k 11. -10k - 3 + 2(5 + 6k) 12. 8 + 9x + 4(11 - 2x) 13. -4(2x - 7) + 6x - 7 14. 9 + 3(4 - 3x) + 12x 15. 5(2y - 4) + 2(y + 9) 16. -4(3u - 1) +7(3 - 2u) 17. 6(-5u + 1) - 3(4u - 12) 18. -3(u + 5) + 8(2u + 1)

1：13x-14

2:-6x+21

3: 20x-18

4:5x+15

5:14n+36

6:-12n+17

7:8n+32

8:k-11

9:-7k+37

10:-13k+34

11:2k+7

12:x+52

13:-2x+21

14:3x+21

15:12y-11

16:-26u+25

17:-42u+42

18:13u-7

the first option is the answer.

the answer would be d.

step-by-step explanation:

move all variables to the left side and all constants to the right side

(x−3)^2+(y−1)^2=16

this is the form of a circle. use this form to determine the center and radius of the circle.

( x − h ) 2 + ( y − k ) 2 = r 2

match the values in this circle to those of the standard form. the variable   r   represents the radius of the circle,   h   represents the x-offset from the origin, and   k   represents the y-offset from origin.

r = 4

h = 3

k = 1

the center of the circle is found at   ( h , k ) .

center:   ( 3 , 1 )

these values represent the important values for graphing and analyzing a circle.

center:   ( 3 , 1 ).

radius:   4