What is the product of the radical expression. (7-2square root) (8+2 square root)

54 - √2

Step-by-step explanation:

(7 - √2)(8 + √2) = 7(8 + √2) - √2(8 + √2)

                            = 7×8 + 7√2 - 8√2 - √4

                            = 7×8 + (7√2 - 8√2) - √4

                            = 56 - √2 - 2

                              = 56  + 2 + 15√2

                             = 54 - √2

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: