I need help. Step by step please. Question 16 & 20.

i dont see the question

Step-by-step explanation:

18

When we have an angle formed from three points on a circle making two chords, so the angle itself is sitting on the circle, the angle is half the arc measure.

If the two chords meet in the middle of the circle, the sum of the arcs enclosed by two opposite (but congruent angles) equals the sum of the angles, so twice either one of them.

In this figure we have the chords meeting outside the circle.  So the two arcs are working against each other, and the included angle, x here, is half the difference of the two arcs,

x = (1/2)(100 - 26) = 74/2 = 37 (degrees)

37

20

Again we have intersecting secants but this time we're concerned with the various lengths.   The theorem says the product of the piece outside the circle times the total segment (to the other side of the triangle) is the same whichever line we use.  Here that means

6(6+x) = 5(5+10)

36 + 6x = 75

6x = 39

x = 13/2

13/2

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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