It is d work shown in the picture
To find the x value of the vertex we do:
x =

if your quadratic function is in the form ax² + bx + c = y
x =

x =

Now we plug this x into the equation and solve for y.
y =

y =

y =

y =

y =

y =

Your vertex (if my math is correct) is at
Answer:
-49
Step-by-step explanation:
First you convert them in improper fraction then it comes
35/3 × -21/5
With the help of cross multiplication we get
7×-7
And then 7×-7 = -49
Answer:
89.375 or 89.4 if rounded
Step-by-step explanation:
715 divided by 8 = 89.375
check this by doing 89.375 x 8
hope this helps