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Korolek [52]
3 years ago
11

During a research​ experiment, it was found that the number of bacteria in a culture grew at a rate proportional to its size. At

5​:00 AM there were 6 comma 000 bacteria present in the culture. At​ noon, the number of bacteria grew to 6 comma 500. How many bacteria will there be at​ midnight?
Mathematics
1 answer:
inessss [21]3 years ago
7 0

Answer:

Step-by-step explanation:

Noon is 12:00

5am to 12noon is 7 hours

6,000 to 6,500

It grew by 500 in 7 hours

So one hour it is 500/7

In 12 hours that is from 12noon to 12midnight it will be 12×500/7+6500 since at 12noon it was 6500 that will be 6500+857=7357

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You use 4 gallons of water on 14 plants in your garden.At this rate, how much water will it take to water 35 plants?
Naddika [18.5K]

For this case we can make the following rule of three:

4 gallons --------------> 14 plants

x --------------------------> 35 plants

From here, we clear the value of x.

We have then:

x = (\frac{35}{14}) * (4)\\x = 10

therefore, 10 gallons are needed to irrigate 35 plants.

Answer:

it will take 10 gallons to water 35 plants

6 0
3 years ago
Read 2 more answers
Simplify the expression.
Mashcka [7]

Answer:

-2.5

Step-by-step explanation:

-0.25x-6-5.5x-8.4=0

-5.75x-14.4=0

-5.75x=14.4

x= -2.5

3 0
3 years ago
PLEASE HELP, ILL GIVE BRAINLIEST! SIMPLE MATHS.
dusya [7]
The answer is c i’m pretty sure
7 0
2 years ago
Read 2 more answers
BRAINLIEST!!!
Liula [17]

Answer:

SA = 615.4 yd²

Step-by-step explanation:

The surface area (SA) of a sphere is calculated as

SA = 4πr² ← r is the radius

Here diameter = 14, thus r = 14 ÷ 2 = 7, then

SA = 4π × 7² = 4π × 49 = 196π = 196 × 3.14 ≈ 615.4 yd²

8 0
3 years ago
​
hjlf
4x - 3y + 20 = 0....4x - 3y = -21

4x - 3y = -21.....multiply by -2
5x - 6y = -25
----------------
-8x + 6y = 42 (result of multiplying by -2)
5x - 6y = -25
---------------add
-3x = 17
x = -17/3

this system of equations has 1 solution
4 0
3 years ago
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