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3 years ago

Bacteria in a test tube increase at the rate of 0.9% per hour.

Mathematics

1 answer:

Bad White [126]3 years ago

5 0

Answer:

. (a) A scientist is doing an experiment on bacteria. She finds that the number ofbacteria in a test tube increase at a rate of 0.9% per hour.At 12 noon there are 4500 bacteria.At 3 pm, how many bacteria will be present? Give your answer to 3 significantfigures.

12pm 4500 bacteria1pm 4500 x 1.009 bacteria 2pm 4500 x 1.009 x 1.009 bacteria3pm 4500 x 1.009 x 1.009 x 1.009 bacteriaTherefore at 3pm there are 4620 bacteria present.

Answer: 4620 (3)(b) In another experiment with the same bacteria, the scientist counts 3000 bacteria.How many bacteria were there two hours prior to this measurement?Give your answer to 3 significant figures.

Now 3000 bacteria1 hour ago 3000 ÷ 1.009 bacteria 2 hours ago 3000 ÷ 1.009 ÷ 1.009 bacteriaTherefore 2 hours ago there were 2950 bacteria present

Answer: 2950

Step-by-step explanation:

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Fill in the blank.

natima [27]

The correct answer is: Commutative Property

Further Explanation:

The commutative property states that the order of number doesn't matter and changing the order of numbers or variables will produce the same result.

Commutative Property of Addition:

The Commutative Property of addition means that an expression can be written as a + b = b + a.

Commutative Property of Multiplication:

The Commutative Property of multiplication means that an expression can be written as a • b = b • a

Hence, the correct answer is: Commutative Property

Keywords: Commutative property, addition, multiplication

Learn more about Properties at:

#LearnwithBrainly

4 0

3 years ago

What is the greatest common factor of the polynomial 40x^7+135x^4+5x^4

tensa zangetsu [6.8K]

5x^4

Step-by-step explanation:

simply we take 5x^4 bec. it can be divided by 40 and 135

7 0

3 years ago

While in transit, the antitoxin had to stay between 36ºF and 46ºF. The dogsled teams stopped along the route often to warm the a

eimsori [14]

Range is the difference between the largest and the smallest numbers in a given contest

Hence the range
= 46 - 36
= 10 °F

6 0

2 years ago

X + 3 = 15 Solve the equation and check for the solution

dangina [55]

Answer:

x=12

Step-by-step explanation:

move the 3 to the other side to get x by itself.

check: 12 + 3 = 15

3 0

3 years ago

Read 2 more answers

What is the sum of the squares of 7 and 24 ?

qwelly [4]

Answer:

625

Step-by-step explanation:

8 0

3 years ago