Ineed with math

jonna is 4 years older than her brother. which of the following expressions shows the sum of their ages if b represents jonna's brother's age?

a.2b + 4
b. b + 4
c. 2(b + 4)
d. 4b

i think b but idk let me know the right answer

Which statement is true? the given sides and angles cannot be used to show similarity by either the sss or sas similarity theorems. the given sides and angles can be used to show similarity by the sss similarity theorem only. the given sides and angles can be used to show similarity by the sas similarity theorem only. the given sides and angles can be used to show similarity by both the sss and sas similarity theorems.

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

Ineed me i stuck and i don’t want to get it wrong