Quantity Demanded is the amount of a good or service consumers are willing and oble to buy at different prices during a given period of time.

63. Sabendo que o \( 6^{\circ} \) ano B tem 14 alunos com 10 anos e 21 alunos com 11 anos, determine o que se pede em relação ao total de alunos, regis- trando a fração irredutivel. a) Fração que os alunos com 10 anos representam. b) Fração que os alunos com 11 anos representam.

Decide whether or not the equation has a circle as its graph. If it does, give the cent and the radius. If it does not, describe the graph. \( x^{2}+y^{2}+8 x+4 y+16=0 \) A. The graph of the equation is a line. B. The graph of the equation is a point. C. The graph of the equation is a circle with center \( \square \). (Type an ordered pair D. The radius of the circle is \( \square \). D. The graph is nonexistent.

5. \( y=m x+b \) \( m= \)

9) Un cuadrado que tenga como area \( 16 \mathrm{~cm}^{2} \)

Write equations for the vertical and horizontal lines passing through the point \( (-8,5) \)