A+b
a*b
a-b
a *divide sign*
which one isn't closed

Aformual for 8 bottles of window cleaner calls for 6 cups of rubbing to customers alcohol 2 1/4 gallons of water and 1 1/2 cups of ammonia alcohol would the forula call if a factory made 1,280 bottles for stores to sell to customers

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

If f(x)=x+7 and g(x)=1/x what is (fog)(x)