Only need with 8,9,10 need the answers fast don’t understand

For number 8, x=6. For number 9, x=7. For number 10, x=15

Step-by-step explanation:

#8:

Angle 16x-6 corresponds to the 90 degree angle. Therefore, they are equal.

16x-6=90

Add six: 16x=96

Divide by 16: x=6

#9

Angle 12x-4 and angle 10x+10 correspond. Therefore, they are equal.

12x-4=10x+10

Subtract 10x: 2x-4=10

Add four: 2x=14

Divide by 2: x=7

#10

Angles 7x and 5x+30 are alternate exterior angles. Therefore, they are equal.

7x=5x+30

Subtract 5x: 2x=30

Divide by 2: x=15

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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