Water flows into a tank according to the rate f(t)= (t+6)/(1+t), and at the same time empties out at the rate e(t)= (ln(t+2))/(t+1), with both f(t) and e(t) measured in gallons per minute. how much water, to the nearest galllon, is in the tank at time t=10 minutes.
; i am confused!

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.°