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Tatiana [17]
4 years ago
10

What is the number 21 a prime or composite

Mathematics
1 answer:
Marrrta [24]4 years ago
7 0
21|3 \\ 7|7 \\ 1 \\ \\ 21=3*7 \\ \\ D_{21}= \{1;3;7;21\} \\ \\ it \ means \ that \ 21 \ is \ composite \ number
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Someone please help me I’m really struggling <br> I will give brainliest
viktelen [127]

Answer:

SA ≈ 1134 cm²

General Formulas and Concepts:

<u>Math</u>

  • Pi π = 3.14...

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

<u>Geometry</u>

  • Radius: r = d/2
  • Surface Area of a Sphere: SA = 4πr²

Step-by-step explanation:

<u>Step 1: Define</u>

d = 19 cm

<u>Step 2: Find </u><em><u>SA</u></em>

  1. Substitute [R]:                    r = 19 cm/2
  2. Divide:                                r = 9.5 cm
  3. Substitute [SAS]:               SA = 4π(9.5 cm)²
  4. Exponents:                        SA = 4π(90.25 cm²)
  5. Multiply:                             SA = 361π cm²
  6. Multiply:                             SA = 1134.11 cm²
  7. Round:                               SA ≈ 1134 cm²
8 0
3 years ago
HELPPPPPP PLEASEEEEEEE
m_a_m_a [10]
Ok I’ll bet it will work for me and you
7 0
3 years ago
Haii guys I need help ASAP pleasee
Evgen [1.6K]

Answer: 100

Step-by-step explanation: Part B is 100, you get that answer because you have ten put out the 1 and then the two is telling you to put 2 zeros .

3 0
4 years ago
A) Work out 4 1/7 + 1 1/2​
Vesnalui [34]

Answer:

135/14

9 9/14

Step-by-step explanation:

29/7+11/2

4 0
3 years ago
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A numerical expression is evaluated as shown.
Irina-Kira [14]

Answer:

step 2

Step-by-step explanation:

BODMAS they multiplied first instead of dividing

6 0
3 years ago
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