Ethan buys a new phone. It cost 75$. He will pay for this on his 1st bill. His phone plan charges 0.06 dollars per minute on the phone.
'He has $90 to spend on his 1st bill. How long can he be on his phone to not go over his budget?

250 minutes

Step-by-step explanation:

90-75=15

15/0.06=250

x = 250 minutes

Step-by-step explanation:

The equation for this problem can be set up as follows-

Y = 0.06x+75

y = total phone bill

x= number of minutes on his phone

If Ethan can spend a total of $90 maximum, then y = 90

90 = 0.06x +75 solve for X to determine how many minutes he can be on his phone to reach a $90 total.

x = 250 minutes

answers

\3. yes the presentation (i.e. odd numbers being written as differences of two squares) is possible for all odd natural number however the presentation may not be unique. for example,  57=112−82=292−28257=112−82=292−282.

\4. 2 can't be written as a difference of two squares because 4-1=3 and 1-1=0 and the difference of squares grows to integers larger that 3.

can i get some in proving questions 1 and 2?