2+2×4 that is my question i need help

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

Afactory adds 3 red drops and 2 blue drops of coloring to white paint to make each pint of purple paint. the factory will make 50 gallons of the purple paint.how many drops of red and blue coloring will the factory need in the 50 gallon batch of purple paint.

What properties allow transformation to be used as a problem solving tool