Question

Dada as equações exponenciais determine a alternativa que representa x+y.

Answer 1

10^ 1-7x= 0,001. 10^2y+1= √0,1
10^1-7x = 1/1000
10^1-7x =10^-3
1-7x = -3
-7x= -3-1
x= -4/-7=4/7

10^2y+1= √0,1
10^2y+1= (0,1)^1/2
10^2y+1= 1/10^1/2
10^2y+1= 10^-1/2
2y+1= -1/2
2y= -1/2-1
2y = -1-2/2
2y=- 3/2
4y= -3
y=-3/4
x+y = 4/7-3/4
16-21/28
-5/28