To sew a garment, a seamstress uses 5.7 centimeters of thread for every 7.6 centimeters of fabric. a) if the seamstress uses 4.2 centimeters of thread, how much fabric is involved? b) if the seamstress is working with 21.2 centimeters of fabric, how many centimeters of thread is needed? c) explain how you found your answers and show your work.

a) Since,  

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Therefore, For 4.2 cm of thread, 5.6 cm of fabric involved.

b) Again,

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Therefore, For 21.2 cm of fabric, 15.9 cm of thread is used.

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

6 hours 48 min

step-by-step explanation:

68÷5=13.6

13.6×30=408min=6 hours 48 min.

hope to and hope that my answer is brainliest.(follow me )