Enc has scores of 70, 80, and 82 on his history tests. use an inequality to find the scores he can make on his final exam to receive a b in the class. the final exam
counts as three tests, and a b is received if the final course average is greater than or equal to 80.
enc must score at least an on his final exam to receive a b in the class.
(round to the nearest tenth as needed.)

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)

c

step-by-step explanation: