The effect of the time of day or psychology class is being taught on test scores is being studied in an experiment. The difficulty of test questions has been identified as an extraneous factors I could also affect test scores. How can the difficulty of test questions best be addressed to minimize affect in the experiment?

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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answer:   (s+1)(s+4)

step-by-step explanation:

factor s2+5s+4

s2+5s+4

=(s+1)(s+4)