Question 1 Calculate 7∑r=1(5r−1)Expected answer: Save answer Score: 0/1 Feedback for . Hide feedback.The feedback has changed.This feedback is based on your last submitted answer. Save your changed answer to get updated feedback. Or, you could: ⤺ Go back to the previous part There's nothing more to do from here. Advice We can manipulate the equation like so: 7∑r=1(5r−1)=57∑r=1r+7∑r=1−1=5×7(7+1)2+7×−1 Score: 0/1 Total 0/1 Move to the next questionTry another question like this oneReveal answers