Recall that for integers <em>n</em> > -1,

Then

Answer:
the rate is 70 words per minutes.
Step-by-step explanation:
1400 ÷ 20 = 70
The midpoint would be (13/2 , 4)
Answer:
b=-10
c=25
Step-by-step explanation:
if the only solution is 5 so
x^2+bx+c=(x-5)²=x²-10x+25
b=-10
c=25