Question

Va rogggg,urgent,dau coroana​

Answer 1

$5)a = {2}^{2} + {2}^{3} + {2}^{4} = 4 + 8 + 16 = 28 \\ {a}^{2} = {28}^{2} = 28 \times 28 = 784 \\ b)784$

6) D) 60, deoarece 20×3=60

$7)5l = 5 {dm}^{3} \\ b)5 {dm}^{3}$

8) 47°26'+42°35'=90°1'

B) 90°1'

9) BC=AB÷2=6,4÷2=3,2 cm

B) 3,2 cm