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Mathematics

1 answer:

ElenaW [278]3 years ago

5 0

anserw is 4+4+4+4=16...

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Sum Clear selection A pet store has 8 cats, 12 dogs and 3 rabbits. The ratio 8:23 <br>

Marianna [84]

What’s the question tho it might be 8:2:13

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3 years ago

What is true about the net of a pyramid?

sashaice [31]

Answer:

<h3><em>THE LAST ONE IS THE CORRECT ANSWER BECAUSE ...................</em></h3>

Step-by-step explanation:

A PYRAMID IS A FOUR DIMENSHION FIGURE IT MEANS IT HAS FOUR TRIANGLES : <u>SO CORRECT ONE IS IT CONTAIN ANY NUMBER OF TRIANGLES OR GREATER THAN OR EQUAL TO FOUR.</u>

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3 years ago

Read 2 more answers

The half-life of cesium-137 is 30 years. Suppose we have a

VMariaS [17]

(a) If $y(t)$ is the mass (in mg) remaining after $t$ years, then $y(t) = y(0) e^{kt}=100e^{kt}.$

$y(30) = 100 e^{30k} = \frac{1}{2}(100) \implies e^{30k} = \frac{1}{2} \implies k = -(\ln 2) /30 \implies \\ \\
y(t) = 100e^{-(\ln 2)t/30} = 100 \cdot 2^{-t/30}$

(b) $y(100) = 100 \cdot 2^{-100/30} \approx \text{9.92 mg}$

(c)
$100 e^{- (\ln 2)t/30} = 1\ \implies\ -(\ln 2) t / 30 = \ln \frac{1}{100}\ \implies\ \\ \\
t = -30 \frac{\ln 0.01}{\ln 2} \approx \text{199.3 years}$

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3 years ago

An ostrich can run 25 miles in 40 minutes. How many minutes will it take the ostrich

DiKsa [7]

It will take the Ostrich 64 minutes to run 40 miles, at the same speed

The distance-time ratio is given as:

Distance : Time = 25 miles : 40 minutes

When the distance is 40 miles, the ratio equation becomes

40 miles : Time = 25 miles : 40 minutes

Express as fraction

$\frac{Time}{40} = \frac{40}{25}$