The survival times of adult mosquitoes exposed to a commonly used synthetic pesticide (Phenothrin) follows a normal distribution with a standard deviation of 15.18 seconds. A random sample of 40 mosquitoes has an average survival time of 47.5 seconds. Construct a 99% confidence interval on the mean survival time.

Astudent received the following grades last semester. find the student's semester grade point average. an a is algebra (3 credits), a b in history ( 3 credits), a in sociology ( 3 credits) a d in english ( 3credits) and a c in seminar ( 2credits). an a is worth 4 points, a b is worth 3 points a c is worth 2 points and a d is worth 1 point.

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Which expression shows the sum of the polynomials with like terms grouped together