Which is the unknown in the following word problem? "A librarian took 21 magazines and arranged them in stacks of 7 . How many stacks did the librarian make?"

Write a polynomial of least degree with roots \( -1,1,5 \), and 6 . Write your answer using the variable \( x \) and in standard form with a leading coefficient 1

Lily is older than Alyssa. Their ages are consecutive integers. Find Lily's age if the ent of Lily's age and 3 times Alyssa's age is 109.

Dada la ecuación \( 2 x+4 y=16 \) a) Determinar el par de valores que satisface la ecuación cuando \( x=-2 \). b) Determinar el par de valores que satisface la ecuación cuando \( y=0 \).

Find the area of a sector of a circle having radius r and central angle \( \theta \). \[ \mathrm{r}=11.9 \mathrm{~cm}, \theta=75^{\circ} \] The area is approximately \( \square \mathrm{cm}^{2} \). (Do not round until the final answer. Then round to the nearest tenth as needed.)

Find the minimum \( y \)-value on the graph of \( y=f(x) \) \[ f(x)=x^{2}+7 x \]