∠abc measures 124° and ∠mno measures 56°. therefore, the two angles are
a) complementary.
b) supplementary.
c) congruent.
d) vertical.

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

$5400 is? invested, part of it at 11? % and part of it at 8? %. for a certain? year, the total yield is ? $522.00. how much was invested at each? rate?

Aliter of water contains about 3.35 x 10^25 molecules. a certain river discharges about 2.9x 10^8 l of water every second. about how many molecules does the river discharge every minute? write your answer in scientific notation