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3 years ago

The perimeter of a rectangular feild is 60 ft and it’s width is 20ft find the area of this feild

Mathematics

2 answers:

azamat3 years ago

7 0

give brainliest for this pls

A=200ft²

solniwko [45]3 years ago

3 0

Answer:

200ft?

Step-by-step explanation:

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An infectious strain of bacteria increases in number at a relative growth rate of 200% per hour. When a certain critical number

ladessa [460]

Answer: It will take 2.4 hours or 2 hours 24 minutes for the critical level to be reached if a person gets infected with 10 bacteria

Step-by-step explanation:

*From the question, bacteria increases in number at a growth rate of 200 percent per hour

*If one bacterium infects Mrs Williams for example, in 24 hours Mrs Williams will fall ill.

*Now this means that one bacterium growing at 200% per hour in Mrs Williams' body must have grown to 4800% in 24 hours for her to fall ill

That is: 200%---------1hour

?% --------- 24hours

24/1 ×200 =4800%

Now, if 10 bacteria infects Mrs Williams, how long will it take for her to fall ill? (In another way, when will the critical level of 4800% bacteria be reached?)

1 bacterium grows at -----200% in 1 hour

10 bacteria will grow at----- ?% in 1 hour

That is, 10/1 × 200 = 2000%

This means that 10 bacteria will grow at 2000 percent per hour.

So, if 10 bacteria grows at 200% per hour and consequently infects Mrs Williams, they will grow to 4800% in 2.4 hours and thereby causing the woman to fall sick in just 2.4 hours

That is, 10 bacteria grows at 2000%------1hour

They'll grow to 4800% in -----? hours

= 4800/2000 ×1= 2.4 hours.

Since 60 minutes make 1 hour, 0.4 hours will be: 0.4 ×60 = 24 minutes

Therefore the time required for 10 bacteria infecting a person to reach a critical level before he/she becomes ill is 2hours 24 minutes

3 0

3 years ago

Kendall has 37 inches of yarn to create an outline of the Big Dipper for her science project. Which equation could be used to fi

ss7ja [257]

<u>Answer:</u>

The equation could be used to find out how many inches of yarn will be left when Kendall has finished the project is option D. Not enough information is given

<u>Solution:</u>

Given, Kendall has 37 inches of yarn to create an outline of the Big Dipper for her science project.

We have to find which equation could be used to find out how many inches of yarn will be left when she has finished the project?

In order to find how many inches of yarn left we just need to subtract the used amount of yarn from available piece of yarn, but we are not given any information about the amount of used piece of yarn.

So, not enough information is given,

Hence, option d is correct

4 0

4 years ago

6) A jet travels 480 miles in 2 hours. At this rate, how far could the jet fly in

Sveta_85 [38]

I need help on this too

7 0

4 years ago

Read 2 more answers

Find the solution to the system of equations: x 3y = 7 and 2x 4y = 8 1. isolate x in the first equation: 2. substitute the value

DIA [1.3K]

The solution to the system of equation are x = -2 and y = 3

<h3>How to find the solution of a system of equation?</h3>

x + 3y = 7

2x + 4y = 8

Let's isolate x in the first equation

x = 7 - 3y

substitute the value of x in the second equation.

Therefore,

2(7 - 3y) + 4y = 8

14 - 6y + 4y = 8

-2y = 8 - 14

-2y = -6

y = -6 / -2

y = 3

Hence,

x + 3(3) = 7

x = 7 - 9

x = -2

learn more on equation here: brainly.com/question/12926248

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4 0

2 years ago

A flying squirrel jumped from a tree 11 feet in the air at the initial velocity of 9 ft./s the equation H equals negative 2T squ

Nady [450]

Answer:

The squirrel maximum height (h) = 21.125 ft

Step-by-step explanation:

The objective of this question is to determine the squirrel's maximum height.

Given that:

h = -2t² + 9t + 11

Differentiating h with respect to t, we get;

$\dfrac{dh}{dt}= -4t +9$

At the time dh/dt = 0, the velocity is maximum

Thus;

-4t = -9

4t = 9

t = 9/4

t = 2.25 seconds

From;

h = -2t² + 9t + 11

h = - 2(2.25)² + 9(2.25) + 11

h = - 10.125 + 20.25 + 11

h = 21.125 ft

4 0

3 years ago