Do these equations have an identity or no solution?

1. 5.5-3b=2b-6.25

2. - s+0.32=2s-0.55

3. - 8t-3t+2=-5t-6t

The weight of outlet boxes is proportional to the volume of boxes involved. if 400 boxes weigh 120 pounds, how much would 500 boxes weigh?

3|2x+5|-9 = 0 solve the absolute value equation

Tony and Tiffany collect semi-precious stones. At the Rockhound Hut, Tiffany paid $38 for 9 pounds of snowflake obsidian. At The Solid Rock Shop, Tony paid $19 for 3 pounds of the same type of stone. Who made the better buy?

A sand dune stands 5 feet above sea level. The hill is eroding at a rate of 1 foot per 20 years. Let y represent the height of the sand dune after x years. Which equation represents the situation?

3 gallons coverted to cups

One radio station broadcasts a weather forecast every 18 minutes and another broadcasts A commercial every 15 minutes. If both stations broadcast both a weather forecast and commercial at noon when is the next time both broadcast at the same time

Mellisa exercises for 20 minutes

Andrew paid $10 for a burger. The burgers went on sale and there was a discount of 20%. What was the sale price of the burgers?

The length of a rectangle is six times its width. if the area of the rectangle is 216 m2, find its perimeter.

Lori had 91 apples and Jay had 68 apples how many apples do they have in all? I don't know if I should multiply 68*91