We have that
A:) 5x²+7x=15------------>5x²+7x-15=0
is appropriately solved by using the quadratic formula because the <span>solution is not direct</span>
<span>B:) (x+8)(x+9)=0
i</span>s not appropriately solved by using the quadratic formula because the <span>solution is direct
the solution is
x=-8
x=-9
</span>C:) (x−3)²=36----------> (x−3)²=6²
is not appropriately solved by using the quadratic formula because the solution is direct
the solution is
x=-3
x=9
D:) 0.25x2+0.8x−8=0is appropriately solved by using the quadratic formula because the solution is not direct
the answer is
the option A) and option D)
Answer:
a, b, and d
Step-by-step explanation:
you can have the same output, but not the same input
Answer: The stoplights will change color after 33 seconds . at the same time again.
Step-by-step explanation:
Given: Stoplight A changes color every 15 seconds and Stoplight B changes color every 45 seconds.
Then, the number of seconds after which they change color at the same time again = least common multiple of 15 and 45.
Since, 15 = 5 x 3 , 45 = 3 x 3 x 5
Least common multiple of 15 and 45. = 3 x 3 x 5 = 45
Since, Both stoplights changed color 12 seconds ago.
So after 45-12 = 33 seconds .
Hence, the stoplights will change color after 33 seconds . at the same time again.
He would spend $27.50, because each bag costs $5.50. Multiply that by 5 and you have your answer :)
I believe it is x = 5/2 = 2.500