What is the speed of a wave with a wavelength of 3 m and a frequency of .1 hertz?

Me with these questions image attached

Rachel ate a piece of fruit and happened to drop the seeds in her backyard. after a few weeks, she saw a small plant with flowers growing in the backyard. which group does this plant belong to? a. angiosperms b. gymnosperms c. pteridophytes d. bryophytes e. chytrids

Isotopes of the same element have differ in their