Question

1 - A soma dos perímetros do retângulo e do triângulo abaixo, equivale à expressão algébrica: a) 12x. b) 8x + 6. c) 16x + 3. d) 20x + 6. ​

Answer 1

$\boxed{\begin{array}{l}\displaystyle\sf\sum=2\cdot(3x+x+3)+3x+4x+5x\\\displaystyle\sf\sum=2\cdot(4x+3)+12x\\\displaystyle\sf\sum=8x+6+12x\\\displaystyle\sf\sum=20x+6\\\huge\boxed{\boxed{\boxed{\boxed{\sf\maltese~alternativa~d}}}} \end{array}}$