The variable r is directly proportional to the square of t, and r = 144 when t = 72. Write the equation that expresses the relationship between the variables. (Let k represent the variation constant.)

Using the given data, solve for the variation constant k.

Long division setup showing an incomplete calculation. 12 is in the divisor, 6839 is in the dividend, and 5 hundreds and 6 tens is written in the quotient. 6000 is subtracted from 6839 to give 839. an unknown value represented by a box is being subtracted from 839. what number should be placed in the box to complete the division calculation?