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2 years ago

Which is the simplified rational expression for r2-4r+5/r-4

Mathematics

1 answer:

Sliva [168]2 years ago

8 0

Step-by-step explanation:

$\frac{ {r}^{2} - 4r + 5}{r - 4} - \frac{ {r}^{2} + 2r - 8}{r - 4} \\ = \frac{ ({r}^{2} - 4r + 5) - ( {r}^{2} + 2r - 8) }{r + 4} \\ = \frac{ {r}^{2} - {r}^{2} - 4r - 2r + 5 - 8 }{r - 4} \\ = \frac{ - 6r - 3}{r - 4}$

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Sedbober [7]

Answer:

Diapers costs $11 and formula is $13.

Step-by-step explanation:

Let's name diapers as A and formula as B.

Simply the equations:

1A + 2B = $37(1)

2A + 5B = $87(2)

Clear D from one equation.

A = $37 - 2B(1)

Replace D into the other equation.

2*($37 - 2B) + 5B = $87(2)

$74 - 4B + 5B = $87

$74 + B = $87

B = $87 - $74 = $13

Find A, now knowing B.

A = $37 - 2($13)

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2 years ago

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aliina [53]

Answer:

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2 years ago

Evaluate y = 2x + 1 when x = 1

Solnce55 [7]

Answer:

y = 3

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Step-by-step explanation:

Step 1: Define

y = 2x + 1

x = 1

Step 2: Evaluate

Substitute in x: y = 2(1) + 1
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2 years ago

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Answer:

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2 years ago

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Bezzdna [24]

Answer:

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Step-by-step explanation:

use formula

a²-b²=(a+b)(a-b)

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2 years ago