Which equation can be used to represent "six added to twice the sum of a number and four is equal to one-half of the difference of three and the number"?
6+ 2(x + 4) = {(3 - x)
6+ 2(x + 4) = {(x – 3)
(6 + 2)(x + 4) = {(3 – x)
(6 + 2)(x + 4) = {(x - 3)

add all the numbers and check the ones place.

the answer is 486. as the ones place is more than 4, the estimation will be the next 10 ie, 490

your question is incomplete, write all the numbers in the sequence that it tells you.  

step-by-step explanation:

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