The owner of Dennis’s garage wants to fill a 55 gallon drum with a 20% winter mixture of antifreeze for his customers. Denis wants to mix 100% antifreeze with a 10% antifreeze mix to get a 20% mixture. How many gallons of 100% antifreeze and 10% antifreeze does he need in order to fill the drum

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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:

  answer:

  write 548 as 500 + 40 + 8. multiply each addend by 5. then add the three products to get 2,740.

step-by-step explanation:

a'(12.5,11.25)

slope=(y1-y2)/(x1-x2)