Answer:
51
Step-by-step explanation:
I'm not sure which is the nth term, but the next term would be 51 because the numbers are going up by nine.
Yes, because 128 is the greater number
7.75+1.25x= 32.75
32.75-7.75=25
1.25x= 25
25 divided by 1.25
X= 20
Answer: what I understood from the question that you want this side and the other side so the fust side equals 33 and the second side after the equal side equals -20 so 33 = -20
Step-by-step explanation: I hope it is correct .
Answer: The determinant must be zero.
Step-by-step explanation:
For a quadratic equation
a*x^2 + b*x + c = 0
The discriminant is:
D = b^2 - 4*a*c
and the solutions can be finded as:
If D > 0 we have two real solutions
if D = 0 we only have one solution, x = -b/2a
If D < 0 we will have comples solutions, as we will have a negative number inside a square root.
Knowing that for this equation we have only one solution, then we can know that the determinant must be equal to zero.