Answer : D. 6,24,51,72,105
He would have 21 before he bought the 10 stamp because 31-10=21
Answer:
13
Step-by-step explanation:
8x - 20 = 4x + 32 ( F rule angles)
8x-4x=32+20
4x=52
x=52/4
x=13
Answer: x=10
Step-by-step explanation:
=
=
5(x+5)=3(3x-5)
5x+25=9x-15
25=4x-15
4x=40
x=10