Which polynomial represents the difference below? 5x²+9x+3 - (6x²-3x) a. 5x²+3x+3 b. -x²+6x+3 c. -x²+12x+3 d. 5x²+6x+3

c

Step-by-step explanation:

distribute the parenthesis by - 1 and collect like terms

= 5x² + 9x + 3 - 6x² + 3x

= (5x² - 6x²) + (9x + 3x) + 3

= - x² + 12x + 3 → c

the answer is b. 60. each interior angle in 120, so the exterior angle must be 60 in order to add up to 180

step-by-step explanation:

h= 12 inches

step-by-step explanation: