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4 years ago

Evaluate for d = 2. 2(d + 4d)

Mathematics

2 answers:

Lunna [17]4 years ago

8 0

Answer: d = 12

2(2 + 4d)

Disturbte the 2 time everything and you get

4 + 8D add alike variable and the answer is d=12

Sav [38]4 years ago

6 0

Substitute 2 for d.

$2(d + 4d) \\ 2(2 + (4 \times 2)) \\ 2(2 + 8) \\ 2(10) \\ 20$

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3 years ago

A certain theatre is shaped so that the first row has 23 seats and, moving towards the back, each successive row has 2 seats mor

JulsSmile [24]

Answer:

There are $30$ rows in the theater.

Step-by-step explanation:

Given terms.

Seats in order $23,25,27....$ will form an Arithmetic progression.

As the common difference $d=2$ ,same for three consecutive terms so this an AP.

Now accordingly we can put the AP terms.

Total number of seats $S_{n}=1560$

Seats in the first row $a=23$

Seats in the last row $l=81$

Summation of $n$ terms in AP $(S_{n})$

$S_n={\frac{n}{2}[2a+(n-1)d]}$

$S_n=\frac{n}{2}[a+l]$

Using the second equation.

$S_n=\frac{n}{2}[a+l]$

$1560=\frac{n}{2}[23+81]$

$n=\frac{2\times 1560}{23+81}=\frac{3120}{104}=30$

So the number of rows (n) in the theater $=30$

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3 years ago

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aivan3 [116]

In each arrangement, there are 10 flowers. The daisies are 2/10. multiplying 2/10 to 10, we get 2. So there are 2 daisies.

If Morita makes 4 arrangements, then the number of daisies she needs is
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So she need 8 daises for here 4 arrangements.

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3 years ago

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fomenos

Necesitamos el resto del problema, las cituasion resolver

(We need the rest of the problem, the cituation to solve)

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Fiesta28 [93]

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3 years ago