The Franks family ordered 7 pizzas for their son's birthday party on Saturday. They purchased pizzas and gave the delivery man a $15 tip. The totalamount
paid including the tip was $78.

If your looking for the amount per pizza then it’s $9

Step-by-step explanation:

1. 78-15=63

2. 63/7=9

3. 9 dollars per pizza

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)