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pishuonlain [190]
3 years ago
14

I need help on both question .plz plz plz plz plz plz plz plz plz plz plz plz plz plz plz plz plz plz plz plz plz plz plz plz pl

z plz plz help​

Mathematics
1 answer:
Damm [24]3 years ago
8 0

#b

See AB||CD

Hence

\\ \rm\Rrightarrow

\\ \rm\Rrightarrow 90=90

\\ \rm\Rrightarrow \dfrac{1}{2}

\\ \rm\Rrightarrow

Now using angle sum property

\\ \rm\Rrightarrow a+45+45=180

\\ \rm\Rrightarrow a=180-90

\\ \rm\Rrightarrow a=90

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Shalnov [3]

Answer:

I think

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5 0
3 years ago
the sum of the first ten terms of a linear sequence is -60 and the sum of the first fifteen terms is -165. Find the 18th term of
const2013 [10]

Answer:

<h2>          a₁₈ = - 31</h2>

Step-by-step explanation:

S_{10}=\dfrac{2a_1+d(10-1)}{2}\cdot 10\\\\\dfrac{2a_1+9d}{2}\cdot 10=-60\\\\\dfrac{2a_1+9d}{2}=-6\\\\2a_1+9d=-12\\\\2a_1=-12-9d\\\\\\S_{15}=\dfrac{2a_1+d(15-1)}{2}\cdot 15\\\\\dfrac{2a_1+14d}{2}\cdot 15=-165\\\\\dfrac{2a_1+14d}{2}=-11\\\\2a_1+14d=-22\\\\-12-9d+14d=-22\\\\ 5d=-10 \\\\ d=-2\\\\\\2a_1=-12-9(-2)=-12+18=6\\\\a_1=3\\\\\\ a_{18}=a_1+17d=3+17(-2)=3-34=-31

8 0
3 years ago
Find the equation of the line with slope 5/7 and passing through (1, -6).
Amiraneli [1.4K]

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4 years ago
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natita [175]

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No, it's not equivalent

Step-by-step explanation:

Try and solve the one with the bracket first. Expand 8(15-r) : 8x15 and 8x-r = 120 - 8r

Therefore, the equation can now be written as:

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Rearrange the like terms together and solve the equation:

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7 0
3 years ago
Read 2 more answers
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