Wednesday

July 30, 2014

July 30, 2014

Posted by **Brandi** on Saturday, July 23, 2011 at 2:27pm.

- Algebra -
**Reiny**, Saturday, July 23, 2011 at 3:42pmSince this is a half-life type, we can use the base of 1/2

.77 = (1/2)^(t/5730)

ln .77 = ln (.5^(t/5730))

t/5730 = ln.77/ln .5

t = 5730(ln.77/ln.5) = 2160.6

to the nearest 100 years that would be 2200 years.

- Algebra -
**Anonymous**, Sunday, January 22, 2012 at 6:14pmThe atmospheric pressure P in pounds per square inch (psi) is given by the formula below, where a is the altitude above sea level (in miles). If a city has an atmospheric pressure of 13.25 psi, what is its altitude? (Recall that 1 mi = 5,280 ft. Round your answer to the nearest foot.)

**Related Questions**

algebra - An artifact was found and tested for its carbon-14 content. If 84% of ...

algebra - An artifact was found and tested for its carbon-14 content. If 84% of ...

algebra - An artifact was found and tested for its carbon-14 content. If 79% of ...

applied algebra - An artifact was found and tested for its carbon-14 content. If...

alegbra - An artifact was found and tested for its carbon-14 content. If 75% of ...

Alegbra - An artifact was found and tested for its carbon-14 content. If 75% of ...

math - An artifact was found and tested for its carbon-14 content. If 79% of the...

math - An artifact was found and tested for its carbon-14 content. If 76% of the...

Can some guide me - An artifact was found and tested for its carbon-14 content. ...

math - An artifact was found and tested for its carbon-14 content. If 83% of the...