Thursday
December 12, 2013

# Posts by Shay

Total # Posts: 350

chemistry
if you are exposed to all sources of radiation from natural sources and human activities (worldwide average). How many years would it take for you to absorb a fatal dose of radiation plss help

Science chemistry
It takes 1 hour and 17 min. for a 1.000gsample of a certain isotope to decay to 0.121g. What is the half-life of this isotope? plssss helpp

chemistry, i need help like a.s.a.p!!!!
Volume= 3.1 x 4.6 x 1.9 = 27.094cm3 Density=mass/volume = 19.07g / 27.094 cm3 Density= 0.7038g/cm3 or 0.704g/cm3

Chemistry
Carbon-14 has a half-life of 5730 years In a plant fossil you find that the 14 C has decayed to 1/8 of the original amount how long ago was this plant

Physics
A person walks 13.9◦ north of east for 2.51 km. Another person walks due north, then due east to arrive at the same location. How far due north would this person walk? How far due east would this person walk?

Physics
A person walks 13.9◦ north of east for 2.51 km. Another person walks due north, then due east to arrive at the same location. How far due north would this person walk? How far due east would this person walk?

math
add or subtract the following polynomials as indicated (5.9x3 + 3.4x2 -7)-(2.9x3-9.6x2 +3)

math
tracy had coffee once a day, and the special blend she bought at Donna's Coffee Stop cost about \$3.00 a cup. Max bought coffee at Donna's coffee stop twice a day. He bought several different types of special blends that cost \$.400 a cup on average 3. Tracy and Max det...

Math
Find the remainder when 13^18 + 19^12 is divided by 247.

Math
what does x reduce to???? 6x=15(mod 21) 2x=5(mod 7) x= ?(mod)7

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