The population of a local species of dragonfly can be found using an infinite geometric series where a1=42 and the common ratio is 3/4. write the sum in sigma notation and calculate the sound that will be the upper limit of this population

Anyone know? will mark brainliest if you're correct!

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.

The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square