Answer:
70.7
Step-by-step explanation:
(x – h)^2<span> + (y – k)^</span>2<span> = r^2</span><span>, this is the standard form of circle if you asking in that way..</span>
4(2d + 5) = 8d + 20
15x + 18y = 3(5x + 6y)

from the graph we can see that the vertex is at h = -2 and k = - 4, we also know that the parabola runs through the point (-1 , 0)
![\stackrel{vertex}{(\stackrel{h}{-2}~~,~~\stackrel{k}{-4})}\qquad y=a[x-(-2)]^2-4\implies \underline{y=a(x+2)^2-4} \\\\\\ \begin{cases} x=-1\\ y=0 \end{cases}\qquad \implies 0=a(-1+2)^2-4\implies 0=a-4\implies 4=a \\\\[-0.35em] ~\dotfill\\\\ ~\hfill \underline{y=4(x+2)^2-4}~\hfill](https://tex.z-dn.net/?f=%5Cstackrel%7Bvertex%7D%7B%28%5Cstackrel%7Bh%7D%7B-2%7D~~%2C~~%5Cstackrel%7Bk%7D%7B-4%7D%29%7D%5Cqquad%20y%3Da%5Bx-%28-2%29%5D%5E2-4%5Cimplies%20%5Cunderline%7By%3Da%28x%2B2%29%5E2-4%7D%20%5C%5C%5C%5C%5C%5C%20%5Cbegin%7Bcases%7D%20x%3D-1%5C%5C%20y%3D0%20%5Cend%7Bcases%7D%5Cqquad%20%5Cimplies%200%3Da%28-1%2B2%29%5E2-4%5Cimplies%200%3Da-4%5Cimplies%204%3Da%20%5C%5C%5C%5C%5B-0.35em%5D%20~%5Cdotfill%5C%5C%5C%5C%20~%5Chfill%20%5Cunderline%7By%3D4%28x%2B2%29%5E2-4%7D~%5Chfill)
Answer:
value of 6d - c = 46
Step-by-step explanation:
if c = 8 and d = 9
we can put the value of d and c in equation
=》6d - c
=》6×(9) - (8)
=》54 - 8
=》46