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aleksklad [387]
3 years ago
14

What do we use to replace for an unknown number?

Mathematics
1 answer:
Zigmanuir [339]3 years ago
4 0

Answer:

A. A variable

Step-by-step explanation:

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I need help. So it says to find the shaded area, and I'm not really good a things like this
krek1111 [17]

Answer:

86 cm²

Step-by-step explanation:

<u>1) Calculate the area of the square</u>

A=lw\\A=20*20\\A=400

Therefore, the area of the square is 400 cm².

<u>2) Calculate the area of the circle</u>

A=\pi r^2\\

\pi we can substitute with 3.14. To find the radius, we divide the diameter of the circle by 2. 20 cm is the diameter of the circle, so therefore, its radius is 10 cm.

A=3.14*10^2\\A=3.14*100\\A=314

Therefore, the area of the circle is 314 cm².

<u>3) Subtract the area of the circle from the area of the square</u>

A=400-314\\A=86

Therefore, the area of the shaded region is 86 cm².

I hope this helps!

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3 years ago
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What is the simplest form of this expression
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In general, an expression is in simplest form when it is easiest to use. Example, this: 5x + x − 3. Is simpler as: 6x − 3. Common ways to help you simplify: • Combine Like Terms.Step-by-step explanation:sorry if this is isin't right

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3 years ago
Why are Cells Important ​
Akimi4 [234]

Answer:

Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions.

Step-by-step explanation:

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How can coordinate proof be used to show segments are congruent?
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A farmer feeds a cow 9300 milligrams of an antibiotic. Every hour, 50% of the drug breaks down in the cow's body. How much will
hichkok12 [17]

9514 1404 393

Answer:

  about 145.3 mg

Step-by-step explanation:

If half breaks down in the hour, then half remains. That is, each hour the amount remaining is multiplied by 1/2. The remainder after 6 hours is ...

  (9300 mg)(1/2)^6 = 145.3125 gm

About 145.3 mg will be left after 6 hours.

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