Step-by-step explanation:
7a
x2 + 4x + ax + 4a
x2 + ax + 4x + 4a
x (x + a) + 4 (x + a)
:(x + 4)(x+a)
7d
x2+2x-ax-2a
x2-ax+2x-2a
x (x-a)+2 (x-a)
:(x+2)(x-a)
7h
x2-2bx-5x+10b
x2-5x-2bx+10b
x (x-5)-2b(x-5)
:(x-2b)(x-5)
The answer is 40
1.6/40=.04
Answer: 1976
Steps:
Let t* be the year in which the population reached a count of 8920. Solve for t*:

The population grew to the number 8920 in 36 years past 1940, i.e., 1976
70,000,000+8,000,000+600,000+20,000+1,000+80+7 = 78,621,087