Which equation could be used to solve the question below? tirza has b books. her mom has 35 books and her sister has 24 books. they have 83 books in all. how many books does tirza have? a. b + 35 + 24 = 83 b. b - 35 + 24 = 83 c. b + 35 - 24 = 83 d. b - 35 - 24 = 83

The answer would be option A. Because nobody in Tirza's family has a negative amount of books (is that even possible?) B, C, and D are incorrect.

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)

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%