How many solutions does the equation 6a - 3a - 6 = 2 + 3 have?

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

Write a fraction less than 1, which has a denominator of 6 and is greater than 3/4 plz answer !

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?