10 Adam has some marbles. Bradley has twice as many marbles as Adam. Chris has 5 more marbles than Bradley. In total they have 55 marbles. How many marbles does Chris have?

Use Descartes' Rule of Signs to determine the possible numbers of positive and negative real zeros. \[ f(x)=7 x^{3}+7 x^{2}+8 x-3 \] If there is more than one possibility, separate them with commas. (a) Possible number(s) of positive real zeros: (b) Possible number(s) of negative real zeros:

Find the value of \( x \) in the equation below. \[ 24=8 x \]

Multiply. \[ (x+12)^{2} \]

Déduire une écriture simplifiée de a et \( b \) \( a=\sqrt{8+2 \sqrt{15}} \quad b=\sqrt{8-2 \sqrt{15}} \)

\( A C=12,6 \) см; \( \angle B=45^{\circ} ; \angle C=60^{\circ} \) Найди сторону \( A B \). Ответ упрости до наименьшего натурального числа под знаком корня.)