S=n(a1+an)/2 gives the partial sum of an arithmetic sequence. what is the formula solved for an?

Write two subtraction equations that are equivalent to 5 + 12 = 17.

Aplane flies around trip to philadelphia it flies to philadelphia at 220 miles per hour and back home with a tailwind at 280 miles per hour if the total trip takes 6.5 hours how many miles does the plane fly round trip

Calculate the density of benzene if 300ml of it weighs 263g. a. 0.88 g/ml b. 1.14 g/ml c. 78,900 g/ml d. 37 g/ml