The diameter of a human hair is 9x10^-5 meters. the diameter of a spider's silk is 3x10^-6 meters. how much greater is the diameter of a human hair than the diameter of a spider's silk? write your answer in scientific notation.

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 33 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 33 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

You eat $0.85 for every cup of hot chocolate you sell. how many cups do you need to sell to earn $55.25