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3 years ago

All living things can be seen with the human eye

Mathematics

2 answers:

juin [17]3 years ago

7 0

That statement would be false.

lilavasa [31]3 years ago

5 0

This could be true and also false, people can see cells and small living things through microscopes. People can also see things like animals, other people, tress, plants and other things. People have a limited eyesight, so some things people can see and some things they can't.

Hope this helped :)

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A study indicated that residents of manchester wasted 2695 gallons of water this tear. That is 50% less than last year . How man

Alenkasestr [34]

Answer:

5390 gallons of water was wasted by the city's residents last year.

Step-by-step explanation:

Let $x$ denotes gallons of water wasted by the city's residents last year.

Gallons of water wasted by the city's residents this year = 2695 gallons

This is 50% less than last year.

Therefore,

$x-\frac{50}{100}x=2695\\\\\frac{50}{100}x=2695\\\\\frac{x}{2} =2695\\\\x=2(2695)$

$x=5390$ gallons

So, 5390 gallons of water was wasted by the city's residents last year.

7 0

3 years ago

Natalie wrote that 773.15-200.4=3,531. What mistake did she make?

ahrayia [7]

Answer:

Well her mistake is she didn't subtract correctly

Step-by-step explanation:

Her answer is supoose to be 572.75

4 0

3 years ago

Read 2 more answers

Kendal bought x boxes of cookies to bring to a party. Each boxes contain 12 cookies. She decided to keep 2 boxes for herself. Sh

DedPeter [7]

Answer:

7 boxes

Step-by-step explanation:

Let x represent the amount of cookies that was brought to the party by Kendall

Each box contain 12 cookies

= 12 × x

= 12x

Kendall keeps 2 boxes for herself

= 12 × 2

= 24

Kendall has 60 cookies which she took to the party

Therefore the question can be represented as follows

12x = 24+60

12x= 84

Divide both sides by the coefficient of x which is 12

12x/12= 84/12

x= 7

Hence Kendall brought 7 boxes

5 0

3 years ago

The local ranger station tracked and tagged 2,844 adult female black bears in a national park. A random sample of 9 adult female

Phantasy [73]

Answer:

203

Step-by-step explanation:

Sample size, n = 9

Mean weight, m = 203

Standard deviation = 25

Point estimate for the population mean weight of all black bears that are tagged `

The point estimate of the population mean ;

ΣX / n

Sum of sample / sample size ;

This is the mean value formula for the sample.

However, since it has been given in the question that, sample mean weight value = 203 ; then the point estimate of the population mean weight = 203

8 0

3 years ago

Situation:A researcher in North America discoversa fossile that contains 65% of its originalamount of C-14..-ktN=NoeNo inital am

zheka24 [161]

SOLUTION

We have been given the equation of the decay as

$\begin{gathered} N=N_0e^{-kt} \\ where\text{ } \\ N_0=initial\text{ amount of C-14 at time t} \\ N=amount\text{ of C-14 at time t = 65\% of N}_0=0.65N_0 \\ k=0.0001 \\ t=time\text{ in years = ?} \end{gathered}$

So we are looking for the time

Plugging the values into the equation, we have

$\begin{gathered} N=N_0e^{-kt} \\ 0.65N_0=N_0e^{-0.0001t} \\ e^{-0.0001t}=\frac{0.65N_0}{N_0} \\ e^{-0.0001t}=0.65 \end{gathered}$

Taking Ln of both sides, we have

$\begin{gathered} ln(e^{-0.000t})=ln(0.65) \\ -0.0001t=ln(0.65) \\ t=\frac{ln(0.65)}{-0.0001} \\ t=4307.82916 \end{gathered}$

Hence the answer is 4308 to the nearest year

8 0

1 year ago