Classify the triangle by its sides 16, 16, and 18
a. equilateral triangle
b. isosceles triangle
c. scalene triangle
d. none of these

B. Isosceles triangle

Step-by-step explanation:

A. Equilateral triangle  - 3 sides equal

B. Isosceles triangle  -2 sides equal

C. Scalene triangle  - no sides equal

D. None of these

Since we have 2 sides equal, it is an isosceles triangle

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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: