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vlada-n [284]
3 years ago
9

What number is 3 more then 20% of 40%?

Mathematics
2 answers:
Kamila [148]3 years ago
7 0

Answer:

8

Step-by-step explanation:

Elina [12.6K]3 years ago
7 0

Answer:

11

Step-by-step explanation:

20% of 40 is just 40/5, which equals 8. 8+3=11.

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150 adults complete a survey.
NARA [144]

Ratio of men:women in the simplest form is 7:8

Step-by-step explanation:

  • Step 1: Given total adults = 150. Number of women = 80. Find the number of men.

Number of men = 150 - 80 = 70

  • Step 2: Find the ratio between men and women.

Men:Women = 70:80 = 7:8

3 0
3 years ago
G(t)= t^2 + 3<br> h(t) = 4t – 3<br> Find (g · h)(-1)
MArishka [77]

Answer:

fifty-two. Explanation: g(h(−1 ))=g(x). x=h(−1)=4(−1)−3=−4−3=−7. g(x)= g(−7)=72+3=49+3=52.

6 0
3 years ago
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
A concrete truck loaded with concrete weighs about 30 tons. About how many pounds does the loaded truck weigh? Show your work.
Rudik [331]
1 ton = 2000 ponds

Multiply: 2000x30=?

2000x30=60000

Hope that helped:)
5 0
3 years ago
{ y = − 2 x − 2 <br> Answer: ( x , y ) = <br> y = 6 x + 14
dsp73
They both equal y so they both equal each other

6 0
3 years ago
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