Write an algebraic expression for the following. the sum of 12 and 3 times a number 12+3 12+3n 12n+3 15

let "a number" = n

"3 times a number" = 3n

"the sum of 12" = "+ 12

Combine the two terms

3n + 12, or (B) is your answer

hope this helps

x =±sqrt(1/3)

step-by-step explanation:

x+4/6x=1/x

multiply each side by 6x to get rid of the fractions

6x*(x+4/6x)=1/x*6x

distribute

6x^2 +4 = 6

subtract 4 from each side

6x^2 +4-4 = 6-4

6x^2 =2

divide by 6

6x^2/6 = 2/6

x^2 = 1/3

take the square root of each side

sqrt(x^2) = ±sqrt(1/3)

x =±sqrt(1/3)