Question

1. 30+(-23)+(-15)+|-7|
2.50-(-3)+(14)+(-7)​

Answer 1

Answer:

In 1698 Thomas Savery patented a pump with hand-operated valves to raise water from mines by suction produced by condensing steam. In about 1712 another Englishman, Thomas Newcomen, developed a more efficient steam engine with a piston separating the condensing steam from the water.

Answer 2

Answer:

1. 30+(-23)+(-15)+|-7|

2.50-(-3)+(14)+(-7)