The average score on a recent test was 75%. one of the students earned a grade of 93% while another student earned a grade of 78%. a total of 23 students took the test. find the average grade of the remaining 21 students.

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)

she will travel a distance in the range of 3 - 11 miles