3 years ago

Please help I will give you brainliest Hector and Grace each labeled QRS Who is correct?

1 answer:

3 0

Grace is bc she labeled right

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saul85 [17]

You just have to do some math and then figure it out. Done

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sergiy2304 [10]

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Naddik [55]

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AURORKA [14]

Answer:

155

Step-by-step explanation:

= (15)x10+5

= 150+5

= 155

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4 years ago

Tamiku [17]

$a_1=153\\a_2=139\\a_3=125\\\vdots\\\\d=a_2-a_1\to d=139-153=-14$

The formula of the sum of the arithmetic sequence:

$S_n=\dfrac{2a_1+(n-1)d}{2}\cdot n$

We have:

$a_1=153\\d=-14\\n=22$

substitute

$S_{22}=\dfrac{2\cdot153+(22-1)\cdot(-14)}{2}\cdot22=(306+21\cdot(-14))\cdot11=132$

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4 years ago