MATHEMATICS MIDDLE SCHOOL

Which of the following is a irrational number a) 787 b) 13/17 c) 4.5102 d) 620

Answers

Answer 1

Answer: according to irrational numbers the answer is c

Answer 2

Answer:

The Answer Is:

c. 4.5102

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There are 20 million bacteria per square centimeter of coral in a coral reef. The coral reef covers 13000 km^2. How many bacteria are there in the coral reef?

Answers

Answer:

2.6 * $10^(21)$ bacteria

Step-by-step explanation:

We know that there are 20 million bacteria in 1 $cm^2$ of coral reef. Let's write the number of bacteria in scientific notation with powers of 10:

$20,000,000= 2*10^7$

Now let's write 1 $cm^2$ in square meters, knowing that one cm equal 0.01 meter ( $10^(-2)$ meters:

$1 \, cm^2 = 1* (10^(-2)\,m)^2= 10^(-4)\, m^2$

So now we can find how many bacteria there is in one $m^2$ of coral reef:

Number of bacteria in $1\,m^2 = 2 * 10^7* 10^4 = 2 * 10^(11)$ bacteria

we can now express 13000 $km^2$ in $m^2$ knowing that 1 km = 1000 m = $10^3$ m:

$13000\,km^2= 1.3 * 10^4 \,km^2=1.3 * 10^4*(10^3m)^2= 1.3*10^4*10^6\'m^2=$

Since we know the number of bacteria per every $m^2$ of coral reef, the number of bacteria in $1.3*10^(10)\,m^2$ of coral reef will be the product of these two numbers:

Total number of bacteria: $2*10^(11) * 1.3*10^(10)=2.6* 10^(21)$

LaDanian wants to write the fraction 4 / 6 as a sum of unit fractions. what expression should he write

Answers

He wants to write the fraction 4 / 6 as a sum of unit fractions. It is written as follows:

1/6 +1/6 +1/6+ 1/6= 4/6.

A unit fraction has a numerator of 1 so since 4 is the numerator in 4/6 you would have to add 1/6 for four times.

Hope this answers the question. Have a nice day.

Which is the best to buy?A) 16 oz of hand soap for $2.40

B) 20 oz of Hand soap for $2.80

C) 24 oz of hand soap for $3.00

D) 12 oz of hand soap for $2.00

Answers

Answer: C

You want to find out the cost per ounce.

2.4/16 = 15 cents per oz

2.8/20 = 14 cents per oz

3/24 = About 13 cents per oz (0.125)

2/12 = About 17 cents per oz (1.66666667)

The cheapest one is C, about 13 cents per oz.

Fourteen less than five times a number is three themes the number

Answers

Answer:

Let x = the number

5x-14 = 3x

-14 = 3x-5x

-14 = -2x

-14/(-2) = x

7 = x

The number is 7.

Dose anyone know how to solve this

Answers

the answer should be -0.2. Just a tip but there is an app called photomath that is perfect for this. I'm not trying to advertise for anything, just trying to help ; )

7-3^3/-6+10 = 7-27/-6+10 = -20/4 = -5

I need help with this algebra question.
4 (x - b) =x

Answers

4 (x - b) = x Use the DIstributive Property [(4(x) - 4(b)]
4 x - 4b = x Add 4b to both sides
4x = 4b + x Subtract x from both sides
3x = 4b Divide both sides by 3
x = $(4b)/(3)$

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