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2 years ago

How do i solve 19. c)

Mathematics

1 answer:

sladkih [1.3K]2 years ago

5 0

Answer:

n₁ = 8

n₂ = - 3

Step-by-step explanation:

√(7n + 25) - n = 1

√(7n + 25) = n + 1

[√(7n + 25)]² = (n + 1)²

7n + 25 = n² + 2n + 1

n² + 2n + 1 - 7n - 25 = 0

n² - 5n - 24 = 0

n² + 3n - 8n - 24 = 0

n(n + 3) - 8(n + 3) = 0

(n - 8)(n + 3) = 0

n - 8 = 0 => n₁ = 8

n + 3 = 0 => n₂ = - 3

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3 years ago

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Anna [14]

Answer:

$\frac{1}{5} (2x+10)=4$ $x=5$

$\frac{1}{3} (3x+9)=9$ $x=6$

Step-by-step explanation:

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--------------------------------------------------------------------

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Substitute x for 6

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2 years ago

Brand X sells 21 oz. Bags of mixed nuts that contain 29% peanuts. To make their product they combine brand A mixed nuts which co

masha68 [24]

Answer:

Brand X has to mix 8.4 oz of brand A mixed nuts which contain 35% peanuts and 12.6 oz of brand B mixed nuts which contain 25%, to obtain 21 oz. Bags of mixed nuts that contain 29% peanuts.

Step-by-step explanation:

We define

$B_{A}=1oz @ 35\%$ , wich means Brand A has 1 oz containing 35% peanuts.

$B_{B}=1oz @ 25\%$ , wich means Brand b has 1 oz containing 25% peanuts.

So we can build an equiation system

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2 years ago