Write the series using Summation notation.
1+ 4 + 9 + 16 + 25 + ...

1+ 4 + 9 + 16 + 25 + 36 + 49

Step-by-step explanation:

difference between consecutive squares:

1 to 4   = 3

4 to 9   = 5

9 to 16  = 7

16 to 25 = 9

25 to 36 = 11

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:

central angle of a triangle has the same measure as its intercepted arc.

step-by-step explanation: