inches is rated at R-11 and 6 inches is rated at R-19. Assuming that this relationship is linear, The R-value of insulation is a

Question

inches is rated at R-11 and 6 inches is rated at R-19. Assuming that this relationship is linear,
The R-value of insulation is a measure of its ability to resist heat transfer. For fiberglass insulation, 3(1/2) write the equation that gives the R-value of fiberglass insulation R as a function of its thickness t (in inches). (Give an answer using exact values. Do not round.)

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