The measures of three angles of a triangle are given by (x - 5)°, (3x)º, and (x + 10)°. What is the value of x?

x = 35º

Step-by-step explanation:

(x - 5)°+ (3x)º+ (x + 10)° = 180º

5x + 5 = 180º

5x = (180 - 5 )º

5x = (175 )º

x = 35º

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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step-by-step explanation: