A community for students.
Here's the question you clicked on:
 0 viewing
AndrewKaiser333
 one year ago
Joe's test grades in History class are: 92%, 89%, 85%, 89%, and 90. The semester final will count as two tests. Joe needs to get a grade of 90% or higher for the semester to get an A. What is the minimum score Joe can get on the final test and average 90%?
AndrewKaiser333
 one year ago
Joe's test grades in History class are: 92%, 89%, 85%, 89%, and 90. The semester final will count as two tests. Joe needs to get a grade of 90% or higher for the semester to get an A. What is the minimum score Joe can get on the final test and average 90%?

This Question is Closed

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1How do you find the average grade of several grades?

AndrewKaiser333
 one year ago
Best ResponseYou've already chosen the best response.1can you look it up i am stumped i was gone from school for several days due to the death of my mom

AndrewKaiser333
 one year ago
Best ResponseYou've already chosen the best response.1I tried and i found nothing i am not sure what you look for first

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1To find the average of several grades, add up all the grades, and divide by the number of grades.

AndrewKaiser333
 one year ago
Best ResponseYou've already chosen the best response.1ok can you start the equation?

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1You are given these test grades: 92, 89, 85, 89, 90 He will take a final exam and get one more grade that counts like two tests. Since we don't know what his final exam grade is, we call it x.

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1That means the sum off all the grades will be: \(92+ 89+ 85+ 89+ 90 +x + x\) Ok so far?

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1To find the average, you divide the sum of the grades by the number of grades. There are 7 grades altogether, so to find the average, we divide the sum by 7. \(\dfrac{92+ 89+ 85+ 89+ 90 +x + x}{7}\) Ok?

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1We want the average to be 90 or more, so we now set it up as an inequality: \(\dfrac{92+ 89+ 85+ 89+ 90 +x + x}{7} \ge 90\)

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1Now we need to solve the inequality for x.

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1First, add all the numbers on the numerator of the fraction. Also, what is x + x = ?

AndrewKaiser333
 one year ago
Best ResponseYou've already chosen the best response.1\[\frac{ 445+2x }{ 7 }\

AndrewKaiser333
 one year ago
Best ResponseYou've already chosen the best response.1\[\frac{ 445+2x }{ 7 }\]

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1Great, so now we have this: \(\dfrac{445 +2x}{7} \ge 90\)

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1Correct. Now multiply both sides by 7 to get rid of the denominator of 7. \(7 \times \dfrac{445 +2x}{7} \ge 7 \times 90\)

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1\(\cancel{7} \times \dfrac{445 +2x}{\cancel{7}~1} \ge 630\) \(445 + 2x \ge 630\) Now subtract 445 from both sides.

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1Correct. Now divide both sides by 2.

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1No. Be careful. Don't switch sides.

AndrewKaiser333
 one year ago
Best ResponseYou've already chosen the best response.1how is it done then

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1We had \(2x \ge 185\) Divide both sides by 2: \(\dfrac{2x}{2} \ge \dfrac{185}{2}\) We get: \(x \ge 92.5\)

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1Correct, but remember it's "greater than or equal", not just plain "greater than."

AndrewKaiser333
 one year ago
Best ResponseYou've already chosen the best response.1thanks i see now

AndrewKaiser333
 one year ago
Best ResponseYou've already chosen the best response.1my keys just won't let me click to do it the way you did it

AndrewKaiser333
 one year ago
Best ResponseYou've already chosen the best response.1it stopped working for some reason

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1Since the answer is \(x \ge 92.5\) That means as long as he gets at least 92.5% on the semester exam, he will have an 90% average, meaning he gets an A grade.
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.