What is the decimal equivalent for 3/10?

How do i make someone brainliest? (if you answer me, i might be able to make you brainliest! )

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers

Timmy uses 1 1 2 cups of sugar for every 2 gallons of lemonade he makes. how many cups of sugar would timmy use if he makes 13 gallons of lemonade?