Which of the following is true for all circles? The ratio of twice the circumference to the radius is equal to π. The ratio of the radius to the diameter is equal to 2π. The ratio of the circumference to half the diameter is equal to π. The ratio of the circumference to the diameter is equal to π.

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.

Lee has $1.75 in dimes and nickels. the number of nickels is 11 more than the number of dimes. how many of each coin does he have?

Tom can paint the fence in 12 hours, but if he works together with a friend they can finish the job in 8 hours. how long would it take for his friend to paint this fence alone?