Find the unit rate and determine which rate is greater: 500 miles in 10 hours or 125 miles in 2 hours.

30 miles in 2.5 hours= 12 mph

Step-by-step explanation:

This is a fraction equal to

30 miles ÷ 2.5 hours

We want a unit rate where

1 is in the denominator,

so we divide top and bottom by 2.5

30 miles÷ 2.5

2.5 hours÷ 2.5

=  

12 miles

1 hour

=  

12 miles

hour

= 12 miles per hour

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: