7. A mountain climber of mass 150 kg climbs from 3,500 m to 4,500 m. What is the change in the climber's potential energy? How much work did he do?

which statement about this sum is true? −245+2.7

terd muffin is the correct answer

c because the news are a source of information of things that happen on the daily and shows evidence about that particular topic

in most common fires, oxygen is needed for an oxidation reaction to takes place. the combination of oxygen with any element as fuel can create fire and combustion will occur especially if wood, light materials and other combustible things are combine with oxygen.