1.2 (II) If ((1*1) + (2*2) + (3*3) + ... + (10*10)) = a, then what is the value of ((2*2)+(4*4) +(6*6) + ... +(20*20)) in terms of a?​

Aretha wanted to gather data about the cost of local bowling leagues in her area. she plotted the data and determined that the average bowling league costs consist of a one-time registration fee and a monthly fee modeled by the equation y = 15x + 20. identify and interpret the y-intercept in this model. the y-intercept is 20. this is the cost per month. the y-intercept is 20. this is the cost of registration. the y-intercept is 15. this is the cost of registration. the y-intercept is 15. this is the cost per month.

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?

What is the simplified form of square root of 400 to the 100th power ?