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.

Question

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

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.

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]

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