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

.

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!