Identify the variation as direct, inverse, joint or combined. r=cs/t

Combined.

Step-by-step explanation:

Variation are generally of 4 types,

Direct Variation- When one of the variables increases or decreases, the other one increases or decreases.

Inverse Variation- When one of the variables increases, the other one decreases and vice versa.

Joint Variation- Where more than two variables are related directly .

Combined Variation- A combination of direct or joint variation, and indirect variation.

So in this case, r is in combined variation with s and t. r is in direct variation with s and inverse variation with t. And c is the proportionality constant.

true

step-by-step explanation:

answer is the third choice:

3x^5+4x^4+x^3+2x^2-10x-7=0

step-by-step explanation: