3 years ago

How do I simplify 7(3x + 9=

Mathematics

2 answers:

sdas [7]3 years ago

8 0

7(3x + 9) =

Distribute the 7 to the 3x and 9

21x + 63

sweet [91]3 years ago

3 0

Answer: 21x +63

Step-by-step explanation:

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If p-1 is a factor of p^4+p^2+p-k the value of k is

Ksju [112]

P=1
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7 0

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

Step-by-step explanation:

Given: a₆ = 12 a₈ = 22

$d=\dfrac{a_8-a_6}{8-6}\quad = \dfrac{22-12}{8-6}\quad =\dfrac{10}{5}\quad =\boxed{5}$

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