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stepladder [879]
3 years ago
15

DE is the perpendicular bisector of AC. Find AC.

Mathematics
1 answer:
Masja [62]3 years ago
7 0

Answer:

Step-by-step explanation:

It is hard to read but (5x - 2) + (7x - 9)  =  AC    also  5x - 2   =   7x - 9

    5x - 2 = 7x - 9         subtract 5x from both sides then add 9 to both sides

5x - 5x - 2 + 9  = 7x - 5x - 9 + 9

   -2 + 9 = 7x - 5x

          7  =  2x

        3.5  =  x

    5x - 2 = 7x - 9    

         3   ≠    -2                        when x = 1

         8   ≠     5                        when x = 2

        13   ≠    12                        when x = 3

     15.5   =    15.5                     when x = 3.5

        18   ≠    19                        when x = 4

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2 years ago
Scores on a certain IQ test are knownto have a mean of 100. A random sample of 43 students attend a series of coaching classes b
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Answer:

Part 1

Type II error

Part 2

No ; is not ; true

Step-by-step explanation:

Data provided in the question

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Based on the given information, the conclusion is as follows

Part 1

Since it is mentioned that the classes are successful which is same treated as a null rejection and at the same time it also accepts the alternate hypothesis

Based on this, it is a failure to deny or reject the false null that represents type II error

Part 2

And if the classes are not successful so we can make successful by making type I error and at the same time type II error is not possible

Therefore no type II error is not possible and when the null hypothesis is true the classes are not successful

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3 years ago
How to find the base of an isosceles when given one side​
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How much higher is the average cost at a clinic<br> than the average cost at a shelter?
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3 0
3 years ago
Which is the measure of the reference angle for 227 degrees ?
Levart [38]

Answer:

  C.  47°

Step-by-step explanation:

The angle between the terminal ray of 227° and the nearest x-axis (the negative x-axis) is ...

  227° -180° = 47°

The reference angle is 47°.

_____

In mathematical terms the reference angle is the minimum of the angle modulo 180° and the supplement of that angle.

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  180° -47° = 133° . . . . supplement of 47°

  min(47°, 133°) = 47° . . . the reference angle

8 0
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