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mojhsa [17]
3 years ago
9

I really suck at math. Can anyone give me good tips to remembering math (algebra and geometry especially) or give me good websit

es to look into?
PLEASE HELP!!!
Mathematics
2 answers:
PilotLPTM [1.2K]3 years ago
7 0

Answer: Symbolab, and this site are going to carry you through algebra.

omeli [17]3 years ago
4 0

Answer:

https://www.mathpapa.com/algebra-calculator.html

Step-by-step explanation:

Mathpapa is a pretty good and reliable algebra calculator would say to use it. It also has Inequalitys and system of equations calculators.

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Answer:

75.398

Step-by-step explanation:

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3 years ago
Alexander Litvinenko was poisoned with 10 micrograms of the radioactive substance Polonium-210. Since radioactive decay follows
koban [17]

Answer:

The amount of Polonium-210 left in his body after 72 days is 6.937 μg.

Step-by-step explanation:

The decay rate of Polonium-210 is the following:

N(t) = N_{0}e^{-\lambda t}     (1)

Where:

N(t) is the quantity of Po-210 at time t =?

N₀ is the initial quantity of Po-210 = 10 μg

λ is the decay constant  

t is the time = 72 d  

The decay rate is 0.502%, hence the quantity that still remains in Alexander is 99.498%.    

First, we need to find the decay constant:

\lambda = \frac{ln(2)}{t_{1/2}}    (2)

Where t(1/2) is the half-life of Po-210 = 138.376 days

By entering equation (2) into (1) we have:

N(t) = N_{0}e^{-\frac{ln(2)}{t_{1/2}}*t}} = 10* \frac{99.498}{100}*e^{-\frac{ln(2)}{138.376}*72} = 6.937 \mu g    

Therefore, the amount of Polonium-210 left in his body after 72 days is 6.937 μg.  

I hope it helps you!  

8 0
3 years ago
A summer camp has 32 campers. A total of 22 of them swim, 20 play softball, and 5 do not swim or play softball. Which values com
Ierofanga [76]

Answer:

a = 15, b = 7, c = 5, d = 10, e = 12

Step-by-step explanation:

You only need to find d.

22+d=32, d=10

Only one choice has d=10

Don't waste time checking the others.

5 0
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