Astore sells small notebooks for $6 and large notebooks for $12. if a student buys 6 notebooks and spends $54, how many of each size did he buy?

small = x

large = y

x+y = 6

x=6-y

6x +12y = 54

6(6-y) + 12y =54

36-6y +12y = 54

6y =18

y = 18/6 =3

they bought 3 small and 3 large

check 3*6 =18

3*12 =36

36+18 = 54

3432532

step-by-step explanation:

b. an equilateral triangle inscribed in a circle

step-by-step explanation:

we are given the figure of two circles having a triangle inside.

now, we know that,

"when a figure is lying inside an another figure, then the outside figure is known as circumscribed figure and the figure lying inside is referred to as the inscribed figure".

as we see that, the circles are containing the triangle completely.

thus, the circles are the circumscribed figures and the triangle is the inscribed figure.

hence, we get, 'an equilateral triangle is inscribed in a circle'.