3: efetue como achar melhor.
a) (x+7)²
b) (5+2m)²
c) (a+3x)²
d) (10x+y)²

$7.

Step-by-step explanation:

It is given that the printing company charges a certain amount for each shirt plus a setup fee of $40.

Let x be the cost of each t-shirt.

There are 21 students in the drama club. So, total cost of 21 t-shirts is

It is given that the t-shirt order costs a total of $187.

Divide both sides by 21.

Therefore, the cost of each t-shirt is $7.