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4 years ago

Which rectangle will have the largest area?

Mathematics

2 answers:

natima [27]4 years ago

5 0

Answer:

it’s the third one

l = 4 w = 7

Step-by-step explanation:

to find the area you multiply length by width

4x7 = 28

slavikrds [6]4 years ago

4 0

Answer: l = 4 cm, w = 7 cm

Step-by-step explanation:

i think that this is it

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Elmer has a collection of 300 fossils .of these , 21% are fossilized snail shells.how many fossilized snail shells does Elmer ha

AVprozaik [17]

Answer

63 are snail shells

Step-by-step explanation:

All I did was 300x.21 to get 63

6 0

4 years ago

Alex had 4 cakes. He gives his friend 3, how many does he have?

Oduvanchick [21]

Answer:

Alex has 1 cake

Step-by-step explanation:

I mean pretty simple subtraction here, it's 4-3=1. That's finger math dude

7 0

4 years ago

Read 2 more answers

The half-life of a radioactive substance is the time it takes for a quantity of the substance to decay to half of the initial am

posledela

Step-by-step walkthrough:

Well a standard half-life equation looks like this.

$N = N_0 * (\frac{1}{2})^{t/p$

$N_0$ is the starting amount of parent element.

$N$ is the end amount of parent element

$t$ is the time elapsed

$p$ is a half-life decay period

We know that the starting amount is 74g, and the period for a half-life is 2.8 days.

Therefore you can create a function based off of the original equation, just sub in the values you already know.

$N(t) = 74g * (\frac{1}{2})^{t/2.8days$

This is easy now that we have already made the function. Here we just reuse it, but plug in 2.8 days.

$N(t) = 74g * (\frac{1}{2})^{t/2.8days} = N(2.8days) = 74g * (\frac{1}{2})^{2.8days/2.8days}\\= 74g * \frac{1}{2} = 37g$

Now we just gotta do some algebra. Use the original function but this time, replace $N(t)$ with 10g and solve algebraically.

$10g = 74g * (\frac{1}{2})^{t/2.8days}\\\\\frac{10g}{74g} = (\frac{1}{2})^{t/2.8days}$

Take the log of both sides.

$log(\frac{5}{37}) = log((\frac{1}{2})^{t/2.8days})$

Use the exponent rule for log laws that, $log(b^x) = x*log(b)$

$log(\frac{5}{37}) = \frac{t}{2.8days} * log(\frac{1}{2})$

$\frac{log(\frac{5}{37})}{log(\frac{1}{2})} = \frac{t}{2.8days}$

$2.8 * \frac{log(\frac{5}{37})}{log(\frac{1}{2})} = t$

slap that in your calculator and you get

$t = 8.1 days$

7 0

2 years ago

Kara has 21 collectible buttons to sell. She sells the small buttons for $3 and the large buttons for $4, and earns a total of $

Sergeeva-Olga [200]

The best and most correct answer among the choices provided by your question is the first choice or letter A. The<span> systems of equations can be used to calculate the number of large and small buttons sold are:
</span>
<span>x + y = 21
3x + 4y = 68</span>

I hope my answer has come to your help. Thank you for posting your question here in Brainly.

3 0

3 years ago

Sarah wants to print copies of her artwork. At the local print shop, it costs her $1 to make 5 copies and $5 to make 25 copies.

Nata [24]

Answer:

$20

Step-by-step explanation:

5 copies cost $1.

25 copies cost $5.

So you have to do 100/5=$20 for 100 copies.

6 0

3 years ago