Question 9 answer is 80 and for 10 it is 72 and for 11 it is 112 and for 12 it is 143
4b²+20b+25=0
Divide everything by 4
b²+5b+ 6.25=0
use the quadratic formula
x= (-b+ or - √b²-4ac) /2a
x= (-5 + or - √5²-4*1*6.25) /2(1)
x= -5/2 so
in this case, b= -5/2
Answer:
D. 180 degrees
Step-by-step explanation:
A straight line is 180 degrees.
The first step would be to isolate a variable (solve for a variable)....so u will have something to sub into the other equation