Observe a expressão á seguir e marque a alternativa correta:(2x-3)2=4x2-12x+9.(A)É um quadrado da soma de dois tempos.(B)É um produto de soma pela diferença de dois termos.(C)É um quadrado da diferença de dois termos.(D)É um polinomio do 4 grau.​

point a is the center of this circle.

the ratio of the lengths of (ef/bc) and (ad/ih) is 2: 1.

step-by-step explanation:

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: