Aman is 9 years older than his brother, if the product of their ages is divided by the sum of their ages, the answer is 20. find their ages

Will give brainliest sum of arithmetic series (sigma notation) find the numerical answer to the summation given below. (image shown below)

Neoli is a nurse who works each day from 8: 00 am to 4: 00 pm at the blood collection centre. she takes 45 minutes for her lunch break. on average, it takes neoli 15 minutes to collect each sample and record the patient's details. on average, how many patients can neoli see each day?

Which of the following is an equation of a line parallel to the equation y=4x+1?