algebra
posted by selina
students in a biology class just took a final exam. a formula for predicting the average exam grade on a similar test t months later is.
s(t)=7815log(t+1)
(a)find the students average score when they first took the final exam.
(b)what would be the expected average score be on a retest after 4 months.

selina
I know the answers I just am not sure how to work the problem to get them.
(a)78
(b)67.5
Please help me with the working of these problems.
Thank you
Respond to this Question
Similar Questions

working with data
josephs final averages in science class are shown in the table below. homework % toward final grade20% average93 quizzes % toward final grade20% average92 tests % toward final grade40% average85 final exam % toward final grade20% … 
Statistics
In your biology class, your final grade is based on several things: a lab score, score on two major tests, and your score on the final exam. There are 100 points available for each score. However, the lab score is worth 25% of your … 
college algebra
Students in an English class took a final exam. They took equivalent forms of the exam at monthly intervals thereafter. The average score S(t), in percent, after t months was found to be given by S(t) = 68  20 log (t+1), t > 0 
Algebra
Students in an English class took a final exam. They took equivalent forms of the exam at monthly intervals thereafter. The average score S(t), in percent, after t months was found to be given by . a) What was the average score when … 
College Algebra
Students in an English class took a final exam. They took equivalent forms of the exam at monthly intervals thereafter. The average score S(t), in percent, after t months was found to be given by . a) What was the average score when … 
college algebra
3. Students in an English class took a final exam. They took equivalent forms of the exam at monthly intervals thereafter. The average score S(t), in percent, after t months was found to be given by S(t) = 68 − 20 log (t + 1), … 
math
In your biology class, your final grade is based on several things: a lab score, scores on two major tests, and your score on the final exam. There are 100 points available for each score. However, the lab score is worth 16% of your … 
Statistics
In your biology class, your final grade is based on several things: a lab score, scores on two major tests, and your score on the final exam. There are 100 points available for each score. However, the lab score is worth 15% of your … 
VNS,Math
Mr. Bobby bought 50 shares at $60, and 2 months later purchased 25 shares a $56.at what price should he purchase 25 additional shares in order to have an average price $58 per share? 
math (algebra)
In Professor Tuffguy's mathematics class, 36 students took the final exam. If the average passing grade was 78, the average failing grade was 60, and the class average was 71, how many of these 36 student passed the final?