Question

me ajudem por favor​

Answer 1

Resposta:

4- a)

2× + 12= 108

2×= 108-12

2×= 96

x= 96/2

×= 48

b)

3× - 42 = 2× - 42

3×= 2× - 42+42

3×= 2× -0

3× - 2×= 0

1×=0

×= 0/1

×= 0

5-

A= B+b/2×h

A= 18cm+10cm/2×6

A= 28cm²/2×6

A= 14cm²×6

A= 84cm²