Step-by-step explanation:
1st digit is 1 number (1)
2nd digit is (3,4,5) so it's 3 numbers
third digit is (6,7,8,9) is it's 4 numbers
last 7 digits is 10 (0,1,2,3,4,5,6,7,8,9)
multiply
1*3*4*10=120
so answer is 120 phone numbers
Answer:
n is less than or equal to: 10
10n+20=120
subtract 20
10n=100
divide by 10
n=10
3x+4y=12
Yes
If you graph it and you go to the point (2,9) then the line will pass it
Hope this helps! <3
