Which expression is equal to t + (u + v)? (10 point)

Question 13 options:

1)

(t + u) + v

2)

(t + u) ⋅ v

3)

tu + v

4)

t + uv

Rewrite the equation by splitting the numerator on the left side.

u

uv

-  

v

uv

=  

1

10

→  

1

v

-  

1

u

=  

1

10

Take  

1

u

to the other side and reverse its sign:

1

v

=  

1

10

+  

1

u

Set a common denominator on the right side:

1

v

=  

u + 10

10u

Finally take the reciprocal of both sides:

v =  

10u

u + 10

.

b is the correct answer