Answer:
A. the number of hours it takes for him to finish the race.
Step-by-step explanation:
If this answer is correct, please make me Brainliest!
The answer is <span>252.5 ft
</span><span>y = –0.004x</span>²<span> + x + 2.5
Let's take y = 0 and we'll get the quadratic equation:
</span>–0.004x² + x + 2.5 = 0
The general formula for quadratic equation is:
ax² + bx + c = 0
a = -0.004
b = 1
c = 2.5
![x_{1,2} = \frac{-b+/- \sqrt{ b^{2}-4ac} }{2a} =\frac{-1+/- \sqrt{ 1^{2}-4*(-0.004)*2.5} }{2*(-0.004)} = \frac{-1+/- \sqrt{1+0.04} }{-0.008} = \\ =\frac{-1+/- \sqrt{1.04} }{-0.008} = \frac{-1+/-1.02}{-0.008}](https://tex.z-dn.net/?f=x_%7B1%2C2%7D%20%3D%20%5Cfrac%7B-b%2B%2F-%20%5Csqrt%7B%20b%5E%7B2%7D-4ac%7D%20%7D%7B2a%7D%20%3D%5Cfrac%7B-1%2B%2F-%20%5Csqrt%7B%201%5E%7B2%7D-4%2A%28-0.004%29%2A2.5%7D%20%7D%7B2%2A%28-0.004%29%7D%20%3D%20%5Cfrac%7B-1%2B%2F-%20%5Csqrt%7B1%2B0.04%7D%20%7D%7B-0.008%7D%20%3D%20%5C%5C%20%0A%3D%5Cfrac%7B-1%2B%2F-%20%5Csqrt%7B1.04%7D%20%7D%7B-0.008%7D%20%3D%20%5Cfrac%7B-1%2B%2F-1.02%7D%7B-0.008%7D%20)
![x_1=\frac{-1+1.02}{-0.008} = \frac{0.02}{-0.008} = -2.5 \\ x_2=\frac{-1-1.02}{-0.008} = \frac{2.02}{-0.008} = 252.5](https://tex.z-dn.net/?f=x_1%3D%5Cfrac%7B-1%2B1.02%7D%7B-0.008%7D%20%3D%20%5Cfrac%7B0.02%7D%7B-0.008%7D%20%3D%20-2.5%20%5C%5C%20%0Ax_2%3D%5Cfrac%7B-1-1.02%7D%7B-0.008%7D%20%3D%20%5Cfrac%7B2.02%7D%7B-0.008%7D%20%3D%20252.5)
Since distance cannot be negative (x1), the correct answer is x2 = 252.5 ft
You cant simplify it . it is already simplified
Answer:
y=1
Step-by-step explanation:
the missing parts of the table
You have to build an equation to find the answer,
angles in a straight line add upto 180°
so your equation would be,
12x+30°=180°
-30 -30
=12x=150°
÷12 ÷12
=x=12.5°
now find the measures of the angles by using 12.5 as x.
angle EAF= 2x
=2×12.5
=25° degrees
angle DAE= 4x
=4×12.5
=50°degrees
angle CAD=6x
=6×12.5
=75°degrees
check,
30+25+50+75=180°degrees
hope this helps.......