Answer:
2a + 10
Step-by-step explanation:
the number = 2(a + 5)
= 2a + 10
the horizontal axis is the bottom (____), the title is usually hiden in the task name
This is an arithmetic series with common difference 6
S13 = (13/2)[2*-5 + (13-1)*6)] = 403
X= 48
this is found by simplifying both sides of the equation , then isolating the variable<span />