Which of the following number sentences are true? In each case is explain how you could answer without any calculation to check your answers by doing the indicated calculation a. 20 × 410 =(20 × 400) + (20 × 10)
b 20× 308= (20 × 340) - (20 × 32)
c -20 + (300 × 32) = (-20 + 300) × (-20 + 32)

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the answer is b. 60. each interior angle in 120, so the exterior angle must be 60 in order to add up to 180

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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