MATHEMATICS MIDDLE SCHOOL

Can somebody please help me with this problem

Answers

Answer 1

Answer:

The answer for this problem would be 628.3 Cubic Meters.

To solve, simply follow the way of finding the volume of a cylinder.

Calculate volume of a cylinder: V = πr2h.

Calculate the lateral surface area of a cylinder (just the curved outside)**: L = 2πrh.

Calculate the top and bottom surface area of a cylinder (2 circles): T = B = πr. ...

Total surface area of a closed cylinder is:

628.3

Hope this helps:}

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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: $2*10^(11) * 1.3*10^(10)=2.6* 10^(21)$

Which ones do I choose?

Answers

Answer:

-6w-22

Step-by-step explanation:

-3(2w+6)-4=

= -6w-18-4=

= -6w-22

So,choose C (none of the above) :)

How to factor x^3-4x^2+5x-20 with (x-2)?

Answers

Answer:

Step-by-step explanation:

hello :

x^3-4x^2+5x-20 = x²(x-4)+5(x-4) = (x-4)(x²+5)

The school you want to go to has an acceptance rate of 15% 15%. That means that 15% 15% of the students who apply to the school get in. The school took in 1800 1800 students last year. How many students applied?