Which sets of numbers are closed under addition?

choose all answers that are correct.

a.
{0, 2, 5, 8}

b.
even integers

c.
rational numbers

d.
{0}
plzz ?

The angles below are supplementary. what is the value of x? a pair of supplementary angles is shown. one angle measures 7x + 33, and the other angle measures 70. 5.3 8.14 11 14.7

If a baby uses 15 diapers in 2 days, how many diapers will the baby use in a year?

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil