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3 years ago

Could use some help please and thank you quickly tho it’s timed

Mathematics

1 answer:

andriy [413]3 years ago

5 0

Answer:

option c)

d = 1

Step-by-step explanation:

Given the equation in the question,

-3d / (d² - 2d - 8) + (3 / d-4) = (-2 / d+2)

quadratic factorisation

-3d / (d+2)(d-4) + (3 / d-4) = (-2 / d+2)

-3d / (d+2)(d-4) = (-2 / d+2) - (3 / d-4)

taking LCM on right side

-3d / (d+2)(d-4) = ( -2(d-4) - 3(d+2)) / (d+2)(d-4)

canceling (d+2)(d-4) on both sides

-3d = -2(d-4) - 3(d+2)

-3d = -2d + 8 - 3d - 6

-3d + 2d + 3d = 8 - 6

2d = 2

d = 1

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3 years ago

No one has answered this one

krek1111 [17]

Answer:

$\displaystyle x = \frac{25\sqrt{2}}{2}$

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Equality Properties

Multiplication Property of Equality
Division Property of Equality
Addition Property of Equality
Subtraction Property of Equality

Trigonometry

[Right Triangles Only] SOHCAHTOA
[Right Triangles Only] cosθ = adjacent over hypotenuse

Step-by-step explanation:

Step 1: Define

Identify variables

Angle θ = 45°

Adjacent Leg = 25

Hypotenuse = x

Step 2: Solve for x

Substitute in variables [cosine]: $\displaystyle cos(45^\circ) = \frac{x}{25}$
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Rewrite: $\displaystyle x = 25cos(45^\circ)$
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3 years ago