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MaRussiya [10]
3 years ago
9

Pls help me with this questions​

Mathematics
1 answer:
bazaltina [42]3 years ago
6 0

Step-by-step explanation:

6a

Sn = n/2 [2a + (n-1) d]

(2Sn)/ n = 2a + (n - 1) d

2a + (n-1) d = (2Sn)/n

(n-1) d = (2Sn - 2a)/n

d =  \frac{2sn \:  - 2a}{(n(n - 1))}

d =  \frac{2(sn - a)}{ {n}^{2}  - n}

6b

d =  \frac{2(56 - 25)}{ {32}^{2}  - 32}

d = ¹/16

7a.

E = (mv²)/2 + mgh

E = m( v²/2 + gh)

E/m = v²/2 + gh

E/m - gh = v²/2

2(E/m - gh) = v²

so

v =   \sqrt{2( \frac{e}{m}  - gh)}

7b.

v =   \sqrt{2( \frac{4900}{20}  - 9.8 \times 15)}

v = 14 m/s

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Answer:

A.

Step-by-step explanation:

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3 years ago
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Ksenya-84 [330]

Answer:

35.6

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6 0
3 years ago
Solve the following triangle completely.
RUDIKE [14]

Answer:

The answers is below in bold.

Step-by-step explanation:

(a) A = 180 - 25.6 - 124.4 = 30 degrees.

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b / sin B = c / sin C

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b = 20.53 m.

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a / sin 30 = 39.2 / sin 124.4

a =  (39.2 * sin 30 / sin 124.4

a = 23.75 m.

b). This is solved in a similar way to (a).

First find angle C  using the sine rule.

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4 0
3 years ago
Please help me with this homework question. What's 5+4?
Bogdan [553]

Answer:

9

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Find the surface area of the triangular prism
ArbitrLikvidat [17]

Answer:

168.43524

Step-by-step explanation:

A=ah+bh+ch+1

2﹣a4+2(ab)2+2(ac)2﹣b4+2(bc)2﹣c4=7·6+7·6+7·6+1

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5 0
3 years ago
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