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3 years ago

If a circle has a diameter of 30 meters, which expression gives its area in

Mathematics

1 answer:

sattari [20]3 years ago

3 0

Answer:

C. 15²π

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Geometry

Diameter: d = 2r
Area of a Circle: A = πr²

Step-by-step explanation:

Step 1: Define

d = 30 m

Step 2: Find Area

Substitute [D]: 30 m = 2r
Isolate r: 15 m = r
Rewrite: r = 15 m
Substitute [AC]: A = π(15 m)²
Rearrange: A = 15²π

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4 years ago

System of equation by using substitution 3=y+3x -x+3y=29

Marianna [84]

Answer:

x=-2

y=9

Step-by-step explanation:

3=y+3x ---- A

-x+3y=29 ----B

step 1. rearrange equation A, so you have the "y" variable on one side

3=y+3x

-3x -3x

3-3x=y

y=3-3x ---- C

step 2. Substitute equation C into equation B in place of "y"

-x+3(3-3x)=29 ---foil

-x+9-9x=29 -- collect like terms

-10x+9=29

-9 -9

-10x=20

÷-10 ÷-10

x=-2

Step 3. Substitute x=-2 into equation C to find y

y=3-3(-2)

y=3+6

y=9

Check you answer by subsituting x=-2 and y=9 back into equation A and B

5 0

3 years ago

Please please please please please help me!!!!!

Bond [772]

Answer:

Step-by-step explanation: just trust me.

6 0

3 years ago

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siniylev [52]

Answer:

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8 0

4 years ago

Plz help me solve this question ASAP! R=200/(1-(1.011)^-20/0.011)

Alona [7]

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3 years ago