1. identify the variation as direct, inverse, joint or combined. s/t = 2.r=cs/t3. i=mcn 

these sound like a lot of fancy math words, but it’s really not too bad.   here are some examples of  direct  and  inverse  variation:

when two variables are related directly, the ratio of their values is always the same.  so as one goes up, so does the other, and if one goes down, so does the other.  think of linear direct variation as a “y  = mx” line, where the ratio of  y  to  x  is the  slope  (m).  with direct variation, the  y-intercept is always 0 (zero); this is how it’s defined.

(note that  part variation, or “varies partly”,   means that there is an extra fixed constant, so we’ll have an equation like  y=mx+b, which is our typical linear equation.)

direct variation  problems are typically written:

→                y  =  kx          where  k  is the ratio of  y  to  x  (which is the same as the  slope  or  rate).

some problems will ask for that  k  value (which is called the  constant of variation  or  constant of proportionality  – it’s like a slope! ); others will just give you 3 out of the 4 values for  x  and  y  and you can simply set up a ratio to find the other value.  i’m thinking the  k  comes from the word “constant” in another language.

(i’m assuming in these examples that  direct variation  is  linear; sometime 

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step-by-step explanation:

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step-by-step explanation:

because that's the answer