3 years ago

Are these correct? if not please explain what i did wrong.

Mathematics

1 answer:

Yuki888 [10]3 years ago

3 0

Question 1 is correct

Question 2, the 2nd and 3rd boxes/answers are incorrect. "A plant measured x inches tall last week and 8 inches tall this week"

8 is how tall the plant is this week

x is how tall the plant is last week

Question 3, it's all equivalent except for option 4, so the only option unchecked is option 4

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tigry1 [53]

Answer:

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Step-by-step explanation:

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3 years ago

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sashaice [31]

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3 years ago

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Natali5045456 [20]

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4 years ago

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Step-by-step explanation:

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3 years ago

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gtnhenbr [62]

Answer:

2820 seats
aₙ = 3n + 9

Step-by-step explanation:

This is an AP with:

The first term a₁ = 12
Common difference d = 3
Number of terms n = 40

Number of the seats:

Sₙ = 1/2*n(a₁ + aₙ) = 1/2n(2a₁ + (n - 1)d)
S₄₀ = 1/2*40(12*2 + 39*3) = 2820 seats

Formula of nth term:

aₙ = a₁ + (n - 1)d
aₙ = 12 + (n - 1)*3 = 12 + 3n - 3 = 3n + 9
aₙ = 3n + 9

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3 years ago