Answer:
Write the quadratic equation in general form then choose the value of “b”.
(2x-1)(x+5)=0
<u>A.)9</u>
B.)10
C.)11
Step-by-step explanation:
Expand 
Which is 

So the value of B is 9
Tan x =opposite/ adjacent =9/5
x= arctan(9/5)≈61
Answer:

Step-by-step explanation:
we know that
The standard form of the quadratic equation is equal to
we have

eliminate the parenthesis

group terms that contain the same variable

combine like terms

Answer:
No
Explanation:
75 x 6.75 ÷ 100 = 5.0625
75 + 5.0625 = 80.0625
80.0625 = 80.06$