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$4O/^{0}7$ $0$ $0$ $360=x/920$ $0$

$8.$ If a andB $β$ are the roots of the equation $x^{2}+8x+15=0$ then form the equation whose roots $arQ$ $\left(α+β\right)$ and $3αβ$ $○$ O a). $\right).$ $x^{2}-35x-300=0$ $○$ O b). $\right).x^{2}-37x-360=0$ $○$ O c). $\right).x^{2}-30x+360=0$

$12$ $11$ The following table shows he daily supply of electricity to different places in a town. show the information by a pie diagram, measures of central angles of sectors are $l0$ decided Complete the follov ing activity to find the measures: $11$ Places Supp y of electricity Measure of central angle (Thousand units) $s\right)$ Roads $4$ $\dfrac {4} {30}\times 360=48^{°}$ Factories $12$ $-\times 360=144^{°}$ $-$ Shops $6$ $\dfrac {6} {30}\times 360=$ $\square $ Houses $8$ $-$ $-$ $\times 360=$ $→$ Total $30$

$8.6$ $35\pi $ $10.7810$ $\left(27\right)$ $7$ $8θ^{°}$ far $18$ ft a, F $\left(\pi =$ $-$ $3.14\right)$ $14$ fra $r=18$ $θ=80^{°}$ $\pi =3.14$ $1$ $=l=\dfrac {θ} {360}\times 2\pi x$ $l=\dfrac {80} {360}\times 2\times 3.14\times 18$ $=4\times 2\times 3.14=8\times 314$

$\square $ $2$ $4a^{6}\right)$ $2$ $720$ $n$ $6$ 6,12 $\left(n=2\right)\times 180=x$ $80n$ $-3b0\div x$ $2a$ $2\right)\times $ $360n-360=x$ $20$ $A$ A polygon has $n$ sides. When the number of sides is doubled, the interior angle $1s$ increased by $30^{°}$ Find the value $Ofn$ n. $13\right)$

$B$ The shape opposite is a regular hexagon. Jan $1$ $40$ "The hexagon is regular $40$ all the angles are the same, That makes each interior angle $\dfrac {360} {6}=60^{°}$ What mistakes has Jan made?