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Skylar's grades on four math tests are 85, 78, 77, and 69. What does Skylar need to score on the next test in order to have a mean score of 80? 83 90 91
Skylar needs to get a score of 91 on the next test in order to have a mean score of 80.
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Asked 4/15/2014 5:24:39 PM
Updated 4/15/2014 7:49:14 PM
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t Object]User: x + y = k x - y = k The solution to the system shown is _____. (0, k) (2, 2) (k, 0)
Weegy: Let's use the reduction method by adding them up, you'll cancel out the y's, leaving you with x=k Now if x=k, let's replace k by x x-y=k x-y=x x-x=y 0=y Since x = k and 0 = y, [ we'll say that the solution to this system is (K,0) ] User: 3x - 4y = 7 3x + 2y = -5 When the second equation is subtracted from the first, the resulting equation is _____. -6y = -12 -6y = 12 -2y = -12 2y = 12 Weegy: -6y = 12 User: 5x + y = 6 5x + 3y = -4 The y-coordinate of the solution to the system shown is ___. -5 -1 1 Weegy: that would be -5 User: Given the system of equations, what is the x-coordinate of the solution? y = 3 - 1/2x 3x + 4y = 1 22 -17/2 -11 (More)
Question
Not Answered
Updated 4/14/2014 8:42:52 PM
1 Answer/Comment
y = 3 - 1/2x
3x + 4y = 1
Replace y in the second equation:
3x + 4(3 - 1/2x) = 1
3x + 12 - 2x = 1
x = -11
the x-coordinate of the solution y = 3 - 1/2x, 3x + 4y = 1 is -11.
Added 4/14/2014 8:42:52 PM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [4/14/2014 8:47:28 PM]
t Object]User: A boat makes a 120-mile trip downstream in 3 hours but makes the return trip in 4 hours. What is the rate of the current? 3 mph 4 mph 5 mph User: Solve the system algebraically. 3x - 2y - 1 = 0 y = 5x + 4 What is the solution? {(-9/7,-17/7)} {(9/7,17/7)} {(9/7,-17/7)}
Weegy: Y = 5X + 4 since: 3X - 2Y - 1 = 0 3X - 2(5X + 4) - 1 = 0 3X - 10X - 8 - 1 = 0 -7X - 9 = 0 so: X = - 9/7 Y = 5( - 9/7 ) + 4 Y = - 45/7 + 28/7 = - 17/7 answer is A.{(-9/7,-17/7)} User: 2x - y = 5 x + 3y = 7 What is the value of the y-determinant? 7 9 22 Weegy: Did you mean the determinant of coefficients? 2 -1 1 3 determinant = 2(3) - (-1)(1) = 6+1=7 source: yahoo User: The system shown has _____ solution(s). y = 1/2x + 1 2y - x = 2 no one infinite User: Which of the following equations is equivalent to 1/2x - 2/3y = 5? x - 2y = 30 4x - 3y = 30 3x - 4y = 30 Weegy: 3x - 4y = 30 User: 2x - y = 5 x + 3y = 7 What is the second row of entries for the system determinant? 0, 3 1, 3 3, 7 Weegy: Did you mean the determinant of coefficients? 2 -1 1 3 determinant = 2(3) - (-1)(1) = 6+1=7 source: yahoo User: A boat makes a 120-mile trip downstream in 3 hours but makes the return trip in 4 hours. If b = the rate of the boat in still water and c = the rate of the current, which of the following equations represents the trip upstream? 3(b - c) = 120 4(b - c) = 120 4(b + c) = 120 Weegy: A.3(b - c) = 120 User: In a certain clothing store, 6 shirts and 3 ties cost $79.50, and 3 shirts and 2 ties cost $41. Determine the cost of each shirt. $10.00 $11.00 $12.00 Weegy: 3s + 5t = 60 ......(1) 2s + 3t = 39 ......(2) (1)*2 - (2)*3: t = 3, s = (39 - 3t)/2 = 15 Answer: Shirts cost $12 each, and ties cost $3 each. User: Solve the system algebraically. Check your work. 5x + 2y = 10 3x + 2y = 6 Make sure there are NO SPACES in your answer. Be sure to include a comma. Weegy: The solution for 5x + 2y = 10, 3x + 2y = 6 is (2, 0) (the value of x is 2 and the value of y is zero) User: In which of the following data sets is the mean equal to the mode? 4, 4, 4, 6, 6 4, 5, 5, 5, 6 3, 3, 4, 6, 7 Weegy: 4, 5, 5, 5, 6 is data set where the mean is equal to the mode. (More)
Question
Expert Answered
Updated 5/21/2014 9:57:28 PM
1 Answer/Comment
The system y = 1/2x + 1, 2y - x = 2 has infinite solution(s).
y = 1/2x + 1,
2y - x = 2
institute y in the second equation the result is:
2(1/2x + 1) - x = 2
x + 2 - x = 2
0 = 0
so there are infinitely many solutions for the system y = 1/2x + 1, 2y - x = 2.
Added 5/21/2014 9:57:28 PM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [5/21/2014 9:58:48 PM]
What is the equation of the line, in general form, that passes through point (-1, -1) and is parallel to the line whose equation is x + y = 3? x - y + 2 = 0 x+ y - 2 = 0 x + y + 2 = 0 User: Amanda is taking a quiz that consists of five multiple choice questions, each having three answers from which to choose. If she guesses on each question, what's the probability that Amanda will get 100% on the quiz?
Weegy: 1/15 right because 1/3 is the chance and there is five so 3 times five is 15 User: Write the equation of a circle whose center is at the origin and that contains the point (-3, 0). Weegy: r^2 = (x+3)^2 + y^2 User: If (x + 1)(x - 5) = -9, then which of the following statements is true? x + 1 = 0 or x - 5 = 0 x + 1 = -9 or x - 5 = -9 x - 2 = 0 (More)
Question
Not Answered
Updated 4/21/2014 8:09:17 PM
3 Answers/Comments
The equation of the line, in general form, that passes through point (-1, -1) and is parallel to the line whose equation is x + y = 3 is: x + y + 2 = 0
Added 4/21/2014 8:04:25 PM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [4/21/2014 8:27:16 PM]
The equation of a circle whose center is at the origin and that contains the point (-3, 0) is x^2 + y^2 = 9

Added 4/21/2014 8:07:42 PM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [4/21/2014 8:17:14 PM]
(x + 1)(x - 5) = -9
x^2 - 5x + x - 5 = -9
x^2 - 4x + 4 = 0
(x - 2)^2 = 0
x - 2 = 0

If (x + 1)(x - 5) = -9, then the true statements is: x - 2 = 0.
Added 4/21/2014 8:09:17 PM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [4/21/2014 8:17:17 PM]
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