Please help me find the surface area of these nets ASAP❤️

Which equation represents the partial sum of the geometric series?

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 3 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30∘c on monday, but decreased at a constant rate in the next 3 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.