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kirill115 [55]
3 years ago
11

The score on a trivia game is obtained by subtracting the number of incorrect answers from twice the number of correct answers.

If a player answered 404040 questions and obtained a score of 505050, how many questions did the player answer correctly
Mathematics
1 answer:
labwork [276]3 years ago
8 0

Answer:

30

Step-by-step explanation:

A player answers x correct questions and y incorrect questions for a total of 40 questions.

x + y = 40

The score is obtained by subtracting y incorrect answers from two times the x of correct answers.  The player's score is 50.

2x - y = 50

Use substitution to solve.  Rearrange the first equation so that it is equal to y.  Then, substitute the y-value into the second equation.

x + y = 40

y = 40 - x

2x - y = 50

2x - (40 - x) = 50

2x - 40 + x = 50

3x - 40 = 50

3x = 90

x = 30

Since x was made to represent correct answers, the player had 30 correct answers.

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Ab=6cm Ac=12 calculate the lenght of cd
Alchen [17]

This problem involves the uses of the Pythagorean Theorem as well as the use of Sine.

To start we need to identify what we know and what we don't know. We know that there are two triangles. We are given 2 sides lengths and an angle in one and only an angle in the other. They share one side meaning when we are given 2 sides in one triangle it will be easy to get the third side. What we don't know is the side length of CB DB or CD. We need to find CB in order to find CD.

<em>Pythagorean Theorem for side length CB:</em>

12^2-6^2=√108

√108=10.4 (average)

So CB is equal to 10.4

<em>Sine Calculation for side length CD:</em>

Since we have angle 56* we will use the length we found which will be the opposite side from the angle and then input x for our hypotenuse CD in order to solve.

sin 56* = 10.4/x

sin 56* × x = 10.4/x × x

sin 56*x = 10.4

/sin 56*      /sin 56*

x = 12.544....

or 12.6 (average)

So, to conclude, our answer for CD is 12.6cm.

Hope I helped!

7 0
3 years ago
Read 2 more answers
What is the slope of (-3,-5) (-2,-2)
jeyben [28]

Answer:

m=3

Step-by-step explanation:

6 0
3 years ago
Helppppppppp me please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Blizzard [7]

Answer: 3 ⅞, 3¾, 3⅔, 3 2/5

Step-by-step explanation:

The order of the pencils lengths from greatest to lowest will be converted to percentage to make it easier.

3 7/8 = 3.875

3 2/5 = 3.4

3 3/4 = 3.75

3 2/3 = 3.67

Therefore, from greatest to lowest will be:

3 ⅞, 3¾, 3⅔, 3 2/5

6 0
3 years ago
Which of the following is true for a median? Medians are affected by outliers. Medians can be calculated no matter how the data
Lady bird [3.3K]

Answer:

Option D) is true about median    

Step-by-step explanation:

We are given the following information in the question:

Median:

  • The median is the middle number or the center of the data when the data is sorted in either ascending or descending order.
  • The median is not affected by the presence of any outliers since the data is sorted.

Median:\\\text{If n is odd, then}\\\\Median = \displaystyle\frac{n+1}{2}th ~term \\\\\text{If n is even, then}\\\\Median = \displaystyle\frac{\frac{n}{2}th~term + (\frac{n}{2}+1)th~term}{2}

Option A) Medians are not affected by the outliers

Option B) Medians can only be calculated when the data is sorted.

Option C) This is a false statement about the medians.

Option D) True

When there are even number of observations, the median is the mean of the two middle numbers.

6 0
3 years ago
I need to know how to solve in order to find the equation parallel to the one given.
vampirchik [111]
The answer is A.
If you are asked to find an equation parallel to the other, make sure the equations have the SAME SLOPE, DIFFERENT Y-INTERCEPT
7 0
3 years ago
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