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3 years ago

Help me please !!

Mathematics

1 answer:

Levart [38]3 years ago

7 0

Answer:

Step-by-step explanation:

first 135

second 135 - 20% = 135 - 27 = 108

third 108 - 20% = 108 - 21.6 = 86.4

fourth 86.4 -20% = 86.4 -17.28= 69.12

rounded 69

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What is the period and frequency of a 10-pound weight oscillating (as a pendulum) on a 5-meter-long rope?

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Find the area of a circle with a diameter of

LUCKY_DIMON [66]

Answer:

A. 380.1 mm²

General Formulas and Concepts:

Symbols

π (pi) ≈ 3.14

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Geometry

Area of a Circle Formula: A = πr²

r is radius

Radius Formula: $\displaystyle r = \frac{d}{2}$

d is diameter

Step-by-step explanation:

Step 1: Define

Identify variables

d = 22 mm

Step 2: Derive

Rewrite formula

[Area of a Circle Formula] Substitute in r [Radius Formula]: $\displaystyle A = \pi (\frac{d}{2})^2$
Evaluate exponents: $\displaystyle A = \pi (\frac{d^2}{4})$
Multiply: $\displaystyle A = \frac{\pi d^2}{4}$

Step 3: Solve for A

Substitute in variables [Modified Area of a Circle Formula]: $\displaystyle A = \frac{3.14(22 \ mm)^2}{4}$
Evaluate exponents: $\displaystyle A = \frac{3.14(484 \ mm^2)}{4}$
Multiply: $\displaystyle A = \frac{1520.53 \ mm^2}{4}$
Divide: $\displaystyle A = 380.133 \ mm^2$
Round: $\displaystyle A \approx 380.1 \ mm^2$

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3 years ago