2 years ago

Can someone help plz

Mathematics

2 answers:

AVprozaik [17]2 years ago

7 0

Answer:-3/7
Use two points and then do y-y/x-x

stellarik [79]2 years ago

5 0

Answer:

6. a) 7/3

7. b) Y=20/3(x)

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3 years ago

For an arithmetic sequence, a35=57. If the common difference is 5. Find a1 and the sum of the first 61 terms.

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$\displaystyle\bf\\2)\\A_{61}=a_1+(61-1)\times r=-113+60\times5=-113+300=187\\\\S_{61}=(-113)+(-108)+(-103)+...+(-8)+(-3)+2+7+12+...+187\\\\S_{61}=SA+SB\\\\SA=(-113)+(-108)+(-103)+...+(-8)+(-3)=-(3+8+103+108+113)\\\\n=\frac{113-8}{5}+1=\frac{105}{5}+1=21+1=22~terms\\SA=-\Big( \frac{n(113+3)}{2} \Big)=-\Big( \frac{22\times116}{2} \Big)=-11\times116 =-1276$

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8 0

3 years ago

Can someone help plz ​

Can someone help plz