2 years ago

Help meee plzzzz i dont know what this is

Mathematics

2 answers:

REY [17]2 years ago

8 0

Answer:

sinθ = c/b is the only correct answer

Step-by-step explanation:

all other terms have the ratio inverted.

Korvikt [17]2 years ago

7 0

The answer is D, always remember SOH CAH TOA :)

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HELPP! Calculate S22 for the arithmetic sequence in which a12=2.4 and the common difference is d=3.4

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Answer:

Option A is correct.

Value of $S_{22} = 15.4$

Step-by-step explanation:

Given: $a_{12} = 2.4$ and common difference(d) = 3.4

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$S_n =\frac{n}{2}(2a+(n-1)d)$ , where n is the number of terms, a is the first term and d is the common difference.

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$a_n = a+(n-1)d$ ......[2]

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Put n =12 and d=3.4 in equation [2] we have;

$a_{12} = a+(12-1)(3.4)$

$a_{12} = a+(11)(3.4)$

2.4 = a + 37.4

Simplify:

a = - 35

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we use equation [1];

here, n =2 , a =-35 and d=3.4

$S_{22} = \frac{22}{2}(2(-35)+(22-1)(3.4))$

$S_{22} = (11)(-70+21(3.4))$

$S_{22} = (11)(-70+71.4)$

$S_{22} = (11)(1.4)$

Simplify:

$S_{22} = 15.4$

Therefore, the sum of sequence of 22nd term i.e, $S_{22} = 15.4$

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