Answer:
whats the question ??
Step-by-step explanation:
Solution: Which statement about the scatter plot is true?
The correct answer is option A. As the number of weeks in class increases, the number of keyboarding mistakes decreases.
Explanation: From the scatter plot, we clearly see there exists a negative linear relationship between the number of weeks in class and the number of mistakes. And we know that if there exists a negative linear relationship between the two variables, then the values of two variables move in opposite direction. If the values of one variable goes up, the values of other variable go down. From the given scatter plot, we clearly see the number of mistakes goes down as the number of weeks in class increases. Therefore, the option A is correct
Answer:
- Only one solution
- (x, y) = (-0.8, -3.6)
Step-by-step explanation:
You know there is only one solution because the ratio of x- and y-coefficients is different in the two equations. That means the lines will have different slopes, so must intersect in exactly one point.
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The y-coefficients are opposites, so you can eliminate the y-variable by adding the equations:
(2x -y) + (3x +y) = (2) + (-6)
5x = -4
x = -4/5 = -0.8
Substituting this into the second equation, we have ...
3(-0.8) +y = -6
y = -3.6 . . . . . . . add 2.4 to both sides
The solution is (x, y) = (-0.8, -3.6).
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You can also find the solution by graphing (or using a graphing calculator).
B
2x^2 / 2 = 200/2
x^2 = 100
x = +/- 10 Answer
4% of 25 is 1 so we know it is only a bit more than 25 dollars for the original dinner. 4% of 30 is 1.2 so we know we are close. If we go a little higher, to 31, it is 1.24, and calculating 4% of 32 is 1.28, too much. We could try 31.5, but that is 1.26, too much. Trying with 31.25 gets us to 1.25. This is the right answer but we still need a tip. So we take the decimal point in 32.50, the total bill, and move it one place to the left, giving us 3.25, which is 10% of the bill. However, we need 20% so we should multiply 3.25 by 2, which is 6.50. 6.50 is the tip, so we should add that to the cost. This is 32.50+6.50, or $39.00. All in all, Hannah's meal cost 39 dollars.
