The independent would be the base amount (0.25 in this case) The dependent would be :
the sum of the minutes x 0.25 or the entire phone bill
Answer:
just multiply 7 by 21 and 21 by 7
like
2*21/7*21. + 10*7/21*7
41/147+ 70/147
111/147. Ans
For every 3 you go across you go up 1 so the gradient is rise/run = 1/3
Therefore gradient is 1/3