Solve application problems by adding integers

🌡

In Gaza, people are freezing in winter.  At one day the temperature was -2^oF in the early morning and raised 4 degrees at noon  What was the temperature at none?

Answer = 1($)

The lowest point in the United States is Death Valley, California, with an elevation of feet (282 feet below sea level). Mt. McKinley (Alaska) is the highest point in the United States. Its elevation is 20,602 feet higher than Death Valley. (Source: The World Almanac Book of Facts, 2009)

What is the elevation of Mt. McKinley? 

Answer = 1($)

After a heavy rainstorm, a river that had been 9 feet under flood stage rose 11 feet in a 48-hour period.

Represent that level of the river before the storm using a signed number. 1($)

Find the height of the river after the storm in comparison to flood stages. 2($)

An atom is composed of protons, neutrons, and electrons.  A proton has a positive charge (represented by +1), a nuetron has no charge, and an electron has a negative chare (-1).  Two simple models of atoms are shown below.

1. How many protons does the atom in the figure (a)? 1($) How many electrons? 2($)
2. What is the net charge of the atom in figure (a)? 3($)
3. How many protons does the atom in figure (b) have? 4($) How many electrons? 5($)
4. What is the net charge of the atom in figure (b)? 6($)

The three steps of a chemistry lab experiment are listed here.  The experiment begins with a compound that is stored at -40^oF.

Step 1 Raise the temperature of the compound 200^o.

Step 2 Add sulfur and then raise the temperature 10^o.

Step 3 Add 10 mililiters of water, stir, and raise the temperature 25^o.

What is the resulting temperature of the mixture after step 3?

Answer = 1($) ^oF