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Marina86 [1]
3 years ago
6

a 3 pound tub of butter at n dollars per pound costs $3.85. select the equation that most accurately depicts the word problem

Mathematics
2 answers:
TEA [102]3 years ago
8 0

Answer: the answer is A. 3n = 3.85

Oksi-84 [34.3K]3 years ago
4 0
<span>the equation that most accurately depicts the word problem  is
3xn=$3.85
proof
n=</span>
<span>n=$3.85/3=$1.28
the price is $1.28 per pound, 3 pound costs 3x$1.28=$3.85
</span>
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The seventh term of an arithmetic progression is equal to twice the fifth term. The sum
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Answer:

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Step-by-step explanation:

The n th term of an AP is

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where a₁ is the first term and d the common difference

Given a₇ = 2a₅ , then

a₁ + 6d = 2(a₁ + 4d) = 2a₁ + 8d ( subtract 2a₁ + 8d from both sides )

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The sum to n terms of an AP is

S_{n} = \frac{n}{2} [ 2a₁ + (n - 1)d ]

Given S_{7} = 84 , then

\frac{7}{2} (2a₁ + 6d) = 84

3.5(2a₁ + 6d) = 84 ( divide both sides by 3.5 )

2a₁ + 6d = 24 → (2)

Thus we have 2 equations

- a₁ - 2d = 0 → (1)

2a₁ + 6d = 24 → (2)

Multiplying (1) by 3 and adding to (2) will eliminate d

- 3a₁ - 6d = 0 → (3)

Add (2) and (3) term by term to eliminate d

- a₁ = 24 ( multiply both sides by - 1 )

a₁ = - 24

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3 years ago
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The volume is then

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Step-by-step explanation:

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