Marco jumped rope for 20 more seconds than troy. the letter r represents the number of seconds that troy jumped rope. which expression shows the number of seconds that marco jumped rope?

a. r divided by 20

b. r plus 20

c. r minus 20

d. r20

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.

Find the nonpermissible replacement for binthis expression.b2/5b +5

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