Kevin has an equal number of dimes, nickels, and quarters in his piggy bank. he randomly picks a coin, replaces it, and picks another coin. what is the probability that the sum of the two coins picked is at least 30 cents?
a.

b.

c.

d.

e.

Jabari is power washing houses for a summer job. for every job, he charges an initial fee plus $30 for each hour of work. his total fee for a 4 -hour job, for instance, is $170 . jabari's total fee,f, for a single job is a function of the number,t, of hours it takes him to complete the job. write the function's formula.