How are apart are these two points? (12,5) and (3, 9) I really need help! fifty points if you answer!!

12-5=7

3-9=6

Step-by-step explanation:

12-5 that makes it so when you do the opposite (-12 + -5) you her -7 do the opposite again (-7,7) and therefore 7

3-9/opposite\9-3 the only reason its 9-3 is becouse of how apart they are (9-3) and that makes 6 therefore its 6

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a

d. 145*2 is 290 than the total angle is 360 then minus 290 then divide by two