When I started my rock collection I had 8 rocks. Over the summer I collected 48 additional rocks. At the end of the summer I gave away some of my favorite rocks to friends, but I still have 49 rocks left. Which equation could I use to find out how many rocks I gave away to friends?

Subtraction

Step-by-step explanation:

56 - 49 = 7

7 rocks

Hope this helped!

  or  

step-by-step explanation:

if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or  

x² + 11x + 18 < 0  

[-11 ± sqrt(121 - 72)]/2 = (-11 ± 7)/2  

solution: (-9, -2)

step-by-step explanation: