4 years ago

I need help with solving for number 5

1 answer:

5 0

2(-2x+4)= -6x+12. ---> -4x+8= -6x+12 ---> combine like terms so +4x to -6x to get 8= -2x+12 ---> -12 on both sides to get -4= -2x --> divide both sides by -2 to get 2= x

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3 years ago

Determine 2nd term and rth term of a.p.whose 6 th term is 12 and 8 th term is 22

mario62 [17]

Answer: $\bold{a_2=-8\qquad \qquad a_r=5r-18}$

<u>Step-by-step explanation:</u>

Given: a₆ = 12 a₈ = 22

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$a_n=a_0+d(n-1)\\\\\\\underline{\text{Use}\ a_6\ \text{to find}\ a_o}\\a_6=a_o+5(6-1)\\\\12=a_o+5(6-1)\\\\12=a_o+25\\\\a_0=\boxed{-13}\\\\\\\underline{\text{Equation:}}\\a_n=13+5(n-1)\\.\quad =-13+5n-5\\.\quad =5n-18\\\\\\\underline{2^{nd\ term:}}\\a_2=5(2)-18\\.\quad = 10-18\\.\quad =\boxed{-8}\\\\\\\underline{r^{th}\ term:}\\\boxed{a_r=5r-18}$