After 35 minutes, he started charging his phone. 21 minutes later, the battery is at 23%. Explain how you would determine when the phone will be charged to 100%

91.30 minutes

Step-by-step explanation:

Assuming that when you start charging the phone it had 0% charge, what you should do is a rule of three.

That is, yes in 21 minutes I charge 23%, how long will it take to charge 100%.

charge time     charge percentage.

21 minutes                  23%

 x minutes                  100%

Then it would be:

x = 100 * 21/23 = 91.30

So you would have to wait 91.30 minutes to wait for the full charge.

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

i'll be glad to : )