Simple interest on an amount of $100 for 5 years at a rate of 6% will be

Interest earned over 5 years: $30

this excludes the initial $100 deposited

Step-by-step explanation:

$100 * 0.6 = 6

6 * 5 = 30

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