Question

Me ajudem pfvr gente

Answer 1

Explicação passo-a-passo:

1-

$\frac{14 \times 16}{2} = \frac{224}{2} = 112 \: {cm}^{2}$

2-

$\frac{12 \times 15}{2} = \frac{180}{2} = 90 \: {cm}^{2}$

3- 48 - (9 + 17) = 48 - 26 = 22 cm

4- 42 ÷ 4 = 10,5 cm

$\frac{42 \times 10.5}{2} = \frac{441}{2} = 220.5 \: {cm}^{2}$

5-

$\frac{b \times h}{2} = a \\ \\ \frac{b \times 4}{2} = 48 \\ \\ 4b = 48 \times 2 \\ 4b = 96 \\ b = \frac{96}{4} \\ \\ b = 24 \: m$