Ajudah

1) a) 1750

b)792

c)1078

2)7x+2

Explicação passo-a-passo:

1) a) 2500=100%

x=. 30%

2500.30=7500:100=750

2500-750=1750

b) 990=100

x=20%

990.20=19800:100=198

990-198=792

c)550+990=1540

1540=100

x=30

1540.30=46200:100=462

1540-462=1078

2) 2x+2+3x+2x

7x+2