0
Kate's age 13 years ago is half her age 13 years later. What is her present age?
Wiki User
∙ 15y ago
Kate is 39 years old. Let's break it down. Let's call Kate's age K. Kate's age 13 years ago is K - 13, and her age 13 years from now is K + 13. Her age 13 years ago is half of what it will be in 13 years. The equation that says that is K - 13 = (K + 13) divided by 2. Turn the crank and out pops the answer. K - 13 = (K + 13) divided by 2 [Multiply both sides by 2] 2(K - 13) = K + 13 [Apply the distributive property of multiplication] 2K - 26 = K + 13 [Subtract K from both sides] K - 26 = 13 [Add 26 to both sides] K = 39 Check work. The 39 - 13 = 26, and the 39 + 13 = 52. The 26 is half of 52. We're good.
Wiki User
∙ 15y ago
Add your answer:
Earn +20 pts
A potassium-40 sample starts with 50 atoms and 1.25 billion years later there are 25 atoms. What is the half-life of potassium-40?
1.25 billion years
What does 0.50 percent mean?
half of 1%
How many years are in eight and an half decades?
A decade is 10 years so eight and a half decades is 85 years.
What fraction of the original c14 would you expect to be present in a fossil that is twenty eight thousand six hundred and fifty years old?
The half-life of C14 is 5730 years so the given period is 5 half-lives. You should, therefore, expect approx 2-5 = 0.03125 of the original C14 to remain.
How many years in a half a century?
Since a century is 100 years, half a century would be 50. So, the answer is 50 years.
How long would it take a radioactive isotope to decay if it has a half life of 10 years?
It will take 8 days. The half life is the time it takes half of an element to decay.
Three years ago Jane was one-half as she will be 2 years from now what is janes present age?
shes 10
In NCIS why didn't Abby like Ziva?
because she was close to kate and then ziva was kates replacment...and Ziva's half brother Ari killed kate
How much of 8-gram sample of Hydrogen-3 would still be present after 12.3 years if the half life of a H-3 is 12.3 years?
If 12.3 years is the half-life of Tritium (H-3), then @ 12.3 years only half of the tritium should remain or 4 grams.
A potassium 40 sample starts with 50 atoms and 1.25 billion years later there are 25 atoms What is the half life of potassium 40?
1.25 billion years: 25/50 or half the original atoms have disintegrated in 1.25 billion years, and that is the definition of half life.
If you signed papers when your husband retired and you divorced later will you be entitled to half his pension?
If you get it as part of the settlement or were married 10 or more years you can have half of his social security.
When was The Later Half of Day created?
The Later Half of Day was created in 2008.
When A carbon-14 sample starts with 100 atoms and 5730 years later there are 50 atoms. What is the half-life of carbon-14?
The half-life of carbon-14 is 5 730 years.
What age was he when he was young?
I presume you ask about Jesus. He was about 30 years old when he began to preach and heal, and he died on the cross about three and a half years later.
Who gave Ryan sheckler his first board?
his first board wasnt really his... he found his dad's old-school skateboard when he was 18 months and he rolled in it. He took it with him anywere he went for the next 3 years ... later on at he got his own skateboard as Christmas present at around 4/half years. hope this helps :D
The half-life of C14 is 5730 years. What fraction of the original C14 would you expect to be present in a fossil that is 28650 years old?
There would be 1/32 left.
What half-life of C14 is 5730 years. What fraction of the original C14 would you expect to be present in a fossil that is 28650 years old?
1/32 of the original amount.
