A marine biologist is studying the population of bottle-nosed dolphins that lived in the Gulf of Mexico. On an outing one summer, they captured and tagged 60 dolphins. The next summer, they captured 90 and found that only 12 had been tagged. Based on this data, how many dolphins can they assume are living in the Gulf of Mexico?

Sum is 17 and their difference is 3

With these 5 geometry questions! pls 1.)quadrilateral abcd is inscribed in this circle.what is the measure of ∠a ? enter your answer in the box.°2.)quadrilateral abcd is inscribed in a circle.what is the measure of angle a? enter your answer in the box.m∠a= 3.)quadrilateral abcd is inscribed in this circle.what is the measure of angle b? enter your answer in the box.m∠b= °4.)quadrilateral abcd is inscribed in this circle.what is the measure of angle a? enter your answer in the box.°5.) quadrilateral abcd is inscribed in this circle.what is the measure of angle c? enter your answer in the box.°

X-10/4 when x = –18 a 7 b –2 c –7 d 2