I can’t find the percent someone plz help

The volume of a box varies directly with its length if a box in the group has a length of 30inches and k=24 what is its volume

Solve for b. ab + c= d b= a + old ob=allc-ch b= (d-c/a

Javier bought a painting for $150. each year, the painting's value increases by a factor of 1.15. which expression gives the painting's value after 77 years?