Li2SO4 can u break it up pls

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

What natural processes produce large quantities of co2

4. a 20-kg child is tossed up into the air by her parent. the child is 2 meters off the ground traveling 5 m/s. circle one: ke / gpe / both show your work for finding the values of each type of energy the object has: