Tenacious ran 12 miles in 2 hours. then he ran 36 miles in 3 hours. by how much did his rate increase

6 miles per hour increase

Step-by-step explanation:

12 miles in 2 hours is 12/2 = 6 miles per hour

36 miles in 3 hours 36/3 = 12 miles per hour

Take the 2nd rate and subtract the first rate

12 - 6 = 6 miles per hour increase

answer: for each 3 girls there is 2 boys . 3: 2

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walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40