Question

 Me ajudem por favor??? 











encontre o valor de x nas proporções





a) x/5 = 21/35

b) 10/7 = 50/x

c) 1/7 = x-6/49

d) 5x+3/10 = -21/30

Answer 1

a) x/5=21/35
35x=105
x=105/35
x=3

b)10/7=50/x
10x=350
x=35

c)1/7=x-6/49
7x-42=49
7x=49+42
7x=91
x=91/7
x=13

d)5x+3/10=-21/1
5x+3=-210
5x=-210-3
5x=-213
x=-213/5
x= -42,6