Please do question numbers 1 and 5 plss I GIVE BRAINLIESTT!!

Find the values of y: 3y^3(y^2+ 2/3y)=0

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula , what is the temperature in celsius corresponding to r degrees rankine? a. 9/5(c - 273) b. 9/5(c + 273) c. 5/9( c - 273) d. 5/9( c + 273)