math
posted by joshuah .
how many side and angles does a trapezoid angle, hexagon, and pentagon have?
solve each equation:
13 + y = 3, 3y + 8=3, y over 3= 9
need help with + &  rules for adding whole numbers, decimals, fractions and integers ( do not understand) and rule for multiplying + & 

Google the fist question
hint  hex means 6 and pent means five
13 + y = 3
13 = 13 add

1313 + y = 16
y = 16
=============================
3y + 8=3
8 = 8 add

3 y + 0 = 5
y = 5/3
=============================
y over 3= 9
3 (y/3) = 3 (9)
y = 18 
sorry i do not understand. this is 6th grade math. i am suppose to solve for y. not change what it is equal to.
13 + y = 3