Identify the variation as direct, inverse, joint or combined.
v = cw
a) direct
b) inverse
c) joint
d) combined

we know that

A relationship between two variables, x, and y, represent a direct variation if it can be expressed in the form or

In this problem we have

Let

v-----> the dependent variable

w-----> the independent variable

c-----> the constant of proportionality

therefore

-----> is a linear equation that represent a direct variation

the answer is the option A

Direct

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!