Suppose the temperature of a liquid decreases from 72∘ 72 ∘ F to 55∘ 55 ∘ F after being placed in a 31∘ 31 ∘ F freezer for 55 55 minutes. Use Newtons Law of Cooling, T=A+(T0−A)e−kt, T = A + ( T 0 − A ) e − k t , to find the number of minutes needed for the liquid to cool from 75∘ 75 ∘ F to 58∘ 58 ∘ F in a 28∘ 28 ∘ F freezer. Hint: Round the k k -value to the nearest ten thousandth.

all three statements are true

step-by-step explanation:

a shipping fee of 5% is charged online with every item purchased online

first let's just take each option and calculate them based on this, to see if the answers matched

keith buys a 40 dollar book

40 x 0.05 = 2

therefore there will be a two dollar fee on keith's book

40 + 2 =42

the first statement is true

a chair costs $80

80 x 0.05 = 4

80 + 4 = 84

the second statement is true

george buys a 20 dollar calculator

20 x 0.05 = 1

20 + 1 = 21

the third statements are true

all three statements are true

answer is b chief get it right