Ineed with questions a b c d and e.

Complementary angles are two angles that have a sum of 90°.

Supplementary angles are two angles that have a sum of 180°.

AABCBCDSUPP  90+90=180

BBCAACDCOMPL  45+45=90

CBCACDANEITHER         45+90=135

DABCCDASUPP  90+90=180

EBAC  CADCOMPL  45+45=90

Step-by-step explanation:

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

the answer is 13 cm