Find the area for 5 and 6 and please explain the steps

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer

Marcus and cody both leave the park at the same time, but in opposite directions. if cody travels 6 mph faster than marcus and after 4 hours they are 64 miles apart, how fast is each traveling? solve using rare times time = distance.

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?