Aflower show has an inventory of 60 tulips and 100 roses. which equation is correct?

60 = 3 × 100
60 = × 100
100 = × 60
60 = × 100

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

Would greatly appreciate these 3 answers

Aliter of water contains about 3.35 x 10^25 molecules. a certain river discharges about 2.9x 10^8 l of water every second. about how many molecules does the river discharge every minute? write your answer in scientific notation