SOLUTION: 1) Suppose you are taking a course that has 4 Tests. the first 3 Tests have 100 points each and the fouth has 200 points. to get an A in the course, a student must have an average

Algebra ->  Human-and-algebraic-language -> SOLUTION: 1) Suppose you are taking a course that has 4 Tests. the first 3 Tests have 100 points each and the fouth has 200 points. to get an A in the course, a student must have an average       Log On


   

Question 273475: 1) Suppose you are taking a course that has 4 Tests. the first 3 Tests have 100 points each and the fouth has 200 points. to get an A in the course, a student must have an average of at least 90 percent on the four Tests. your scores on the first 3 Tests were: 87 , 92 and 84. what must you score on the fourth Test to get an A in Course?
2) Suppose your driving on a freeway to a town 150 miles from your home. After 30 minutes you pass a freeway exit that you know is 25 miles from your home. Assuming that you continue at the same constant speed, how long will the entire trip take?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
1) Suppose you are taking a course that has 4 Tests. the first 3 Tests have 100 points each and the fourth has 200 points.
to get an A in the course, a student must have an average of at least 90 percent on the four Tests.
your scores on the first 3 Tests were: 87 , 92 and 84. what must you score on the fourth Test to get an A in Course?
:
Let the 4th test score = x (out of 200)
This test has 200 points, so each point = half a percent therefore:
%2887+%2B+92+%2B+84+%2B+.5x%29%2F4 = 90
Add the given grades and multiply by 4
263 + .5x = 4(90)
.5x = 360 - 263
.5x = 97
Multiply by 2
x = 2(97)
x = 194 points required on a 200 pt test
:
:
2) Suppose your driving on a freeway to a town 150 miles from your home.
After 30 minutes you pass a freeway exit that you know is 25 miles from your home.
Assuming that you continue at the same constant speed, how long will the entire trip take
:
Find the speed you are driving (change 30 min to .5 hr):
You went 25 mi in a half hour
25%2F.5 = 50 mph is your speed
:
Find the time to travel 150 mi at 50 mph (you can do it in your head)
150%2F50 = 3 hrs
:
I assume you are the one who put this problem in my comment section. The trouble with that is, unless you include an email address, I have no way of
knowing who you are or even what problem your talking about.