Answer:
15
Step-by-step explanation:
2.9403x10^15
plsss mark as brainliestt :)
Well here are 3
(0,7);(1,11);(2,15)
4(0) + 7 y:7
You can keep doing it choose a number for x that's and for y multiply 4 times the numer you choosed for x and add 7 to it
18
12 and 15 are both dividable by 3 and 3 apart so if you subtract 21 by 3 than you get 18