Answer:
B
Step-by-step explanation:
Because it is parralel to the ground.
Answer:
Option A is correct, i.e. x = -3, x = 7.
Step-by-step explanation:
Given the equation is x² -4x -21 = 0.
We can compare it with general quadratic equation i.e. ax² +bx +c =0.
then a = 1, b = -4, c = -21.
We can use Quadratic formula as follows:-
x = ( -b ± √(b²-4ac) )/2a
x = ( +4 ± √(16-4*1*-21) )/2*1
x = ( +4 ± √(16+84) )/2
x = ( +4 ± √(100) )/2
x = ( +4 ± 10 )/2
x = (4+10)/2 or x = (4-10)/2
x = 14/2 or x = -6/2
x = 7 or x = -3
Hence, option A is correct, i.e. x = -3, x = 7.
The dish illustrates operations on a parabola.
The depth of the parabolish dish is 160 feet.
The bowl is said to be a parabola.
So, we have:
Where:
From the question, the diameter is 160 feet.
So, the radius (r) is:
So, the coordinate of the depth of the parabola would be:
Substitute these values in
So, we have:
Divide both sides by 160
Rewrite as:
Hence, the depth of the parabolish dish is 160 feet.
Read more about parabolas at:
brainly.com/question/4074088
18 sleep more than 540 and 10 sleep less than 540 hope this helps