Robert has run the first 16 miles of a race, which means he is 72% finished. how long is the race

Solve the triangle. a = 21°, c = 105°, c = 5

If f(x) = 2x + 8 and g(x) = x4, what is (gº)?

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of