how many liters of 10% silver iodide solution must be mixed with 9 liters of 4% iodide solution to get 6% solution

i need on these three questions. find standard form equation of line perpendicular to y = (2/3)x - 8 that goes through the point

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4a. is 3 miles every hour

4b. is 1/3 of an hour per mile

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hello,

b) 62.47% of the students are between 14 and 18 years old.

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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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