Answer:
correct answer is 10
Step-by-step explanation:
a1 = 10 correct
a2 = 10+10 = 20
a3 =20+10 = 30..
Answer:
2x+1y
Step-by-step explanation:
because a variable (the letter) is always 1, in that case 1 + 1 is 2 and 1 x 1 is 1. but since x and y are two different letters you cannot add them. hoped that helped :)
Answer:

Step-by-step explanation:

Don't mind the 