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nevsk [136]
3 years ago
12

Whats 20+1 :3 i hope you lie it!

Mathematics
1 answer:
klio [65]3 years ago
6 0

Answer:

201

Step-by-step explanation:

dat is the answer or is it fish hmmmmm

jk it's 21 if you actually want the real answer

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9. Determine how long it takes for 80% of the material to decay.
Vilka [71]

Using an exponential function, it is found that it takes 18.6 days for 80% of the material to decay.

The amount of a substance after t days is modeled by:

A(t) = A(0)e^{-kt}

In which:

  • k is the decay rate, as a decimal.
  • A(0) is the initial amount.

The half-life is of 8 days, hence A(8) = 0.5A(0), and this is used to find k.

A(t) = A(0)e^{-kt}

0.5A(0) = A(0)e^{-8k}

e^{-8k} = 0.5

\ln{e^{-8k}} = \ln{0.5}

-8k = \ln{0.5}

k = -\frac{\ln{0.5}}{8}

k = 0.08664339757

Hence:

A(t) = A(0)e^{-0.08664339757t}

The time it takes for 80% of the material to decay it t for which A(t) = 0.2A(0), hence:

0.2A(0) = A(0)e^{-0.08664339757t}

e^{-0.08664339757t} = 0.2

\ln{e^{-0.08664339757t}} = \ln{0.2}

-0.08664339757t = \ln{0.2}

t = -\frac{\ln{0.2}}{0.08664339757}

t = 18.6

It takes 18.6 days for 80% of the material to decay.

To learn more about exponential functions, you can take a look at brainly.com/question/24906920

5 0
3 years ago
The ticket price for an ice hockey match used to cost £19.60. The price has now increased by 12.5%. How much will 2 tickets cost
Amanda [17]

Answer:

The 2 tickets will cost £44.10 after the increase.

Step-by-step explanation:

First, you have to multiply £19.60 by 12.5% to find the increase in the cost of tickets.

19.60(0.125)=2.45

Add the price increase to the original cost to find the new cost of each ticket.

19.60+2.45=22.05

Multiply the result by 2 since you have to look for the cost of the 2 tickets.

22.05(2)=44.10

8 0
3 years ago
Which rational functions have an oblique asymptote? Check all that apply. f(x) = x^2+1/x f(x)= 4x^2-6/x+1 f(x)=-x/x^2 f(x)=x^5/x
Nata [24]

Answer:

he1jjdj2jfjxuzwyehhgjcucahhehfj2j2ii281ieb3bbzb,$,×^*$**》 up 7dogs 7in 7a is the sus and the imposter and the other producers of the day dear zamku

5 0
3 years ago
What is the area of this figure? Enter your answer in the box.
Paladinen [302]
The area would be 35 cm squared.

Lets break it down:
Triangle- The area of a triangle is base×height÷2
so if we plug in the numbers, the base would be 5 (the length) and the height would be 4 (the height). 5×4= 20÷2= 10.
Square- The area of a square is base×height so if we pluged in the numbers, the base is 5 (the length) and the height is 5 (the height). 5×5= 25.

10+25= 35 cm squared

Hope this helps!
6 0
3 years ago
Four less than the product of 5 and a number is equal to 9 . Use the variable (w) for the unknown number
ivann1987 [24]

Answer:

w = 13/5

Step-by-step explanation:

The equation is : 5w-4=9

Then we add 4 to each side

5w = 13

Then we divide by 5

w = 13/5

3 0
3 years ago
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