Hector added 30.24 + 16.26. his work is shown.
what error did hector make?
30.24
+16.26
46.410
he did not line up the decimal points properly.
he did not line up the digits properly.
he did not regroup hundredths when adding digits.
he did not regroup tenths when adding digits.

He did not regroup hundredths when adding digits

Step-by-step explanation:

30.24

+16.26

46.50

It can't be the first two, and because .04+.06 are hundredths, it must be the third one.

He did not regroup hundredths when adding digits.

0 is its x and y coordinate

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation: