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3 years ago

If 150 empty water bottles weigh 4.5 pounds what do you expect 90 water empty bottles to weigh?

Mathematics

2 answers:

MakcuM [25]3 years ago

6 0

It's 2.7 pounds because I set up a proportion of 150 over 90 = 4.5 over X and multiplied 90 * 4.5 divided by 150

Rasek [7]3 years ago

3 0

2.7 pounds. I did 150x=4.5, and found that x=.03. Then, you just multiply it by 90 to find the weight.

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A population of bacteria is introduced into a culture. The number of bacteria P can be modeled by P(t) = 800 1 + 9t 90 + t2 , wh

love history [14]

Answer: Hello mate!

you know that the equation is (or at least i think this is):

p(t) = 800 + 9t/90 + t^2

You want to know the "rate of change" after 6 hours.

We know that the rate of change is the derivative of P(t) with respect to t; this is

$\frac{dP(t)}{dt} = 9/90 + 2t$

now we want the rate of change when t = 6, then we replace t by 6 in the derivate equation:

$p(6)' = 0.9 + 2*6 = 12.9$

so the rate of change after 6 hours is 12.9

where $P'(t) = \frac{dP(t)}{dt}$

If the equation is wrong ( because you write P(t) = 800 1 + 9t 90 + t2, and i don really know how to iterprete it) tellme and we can do the derivate again :D

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4 years ago

Tina's aquarium has a capacity of 40 gallons or water. She plans to stock her aquarium with 0.25 inches of fish per quart of cap

Sonbull [250]

Answer:

The number of mollies fishes in the aquarium is 20 .

Step-by-step explanation:

Given as :

The capacity of aquarium = 40 gallons

∵ 1 gallon = 4 quart

∴ 40 gallons = 4 × 40 = 160 quart

Now, According to question

0.25 inches of fish required 1 quart capacity

I.e for 1 quart capacity , 0.25 inches fish

So. for 160 quart capacity , 0.25 × 160 = 40 inches fishes

Now the size of mollies fish = 2 inches

Then , number of mollies fish = $\dfrac{\textrm total size of fishes}{\textrm size of mollies fish}$

I.e Number of mollies fish = $\frac{40}{2}$ = 20

Hence The number of mollies fishes in the aquarium is 20 . Answer

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Answer:

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2 years ago

Read 2 more answers

6. Find the value of r in the following triangle.

makkiz [27]

Answer:

r = 19.2deg

Step-by-step explanation:

6r + 5 = 30 + 90 (exterior angles of a triangle)

6r = 115

r = 19.2deg (1dp)

Topic: Angles

If you like to venture further, feel free to check out my insta (learntionary). I'll be constantly posting math tips and notes! Thanks!

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