Answer: Option D.
Step-by-step explanation:
this is a quadratic equation of the form:
y = ax^2 + bx + c
First, things you must see.
The graph opens up, so we must have thata a is greater than zero, so we can discard the first option.
Second, we can see that the vertex is located in x ≈ 70
The vertex of a quadratic equation is: x = -b/2a
so we have:
70 = -b/2a
let's try our options and see if we can discard other:
B:
-b/2a = 69.9/2 = 34.95
we can discard this option.
C:
-b/2a = 78/2 = 39 we can discard this option.
D:
-b/2a = 69.9/2*0.5 = 69.9
This is the only one that fits, so this is the correct option.
Answer:
Mr doyle the fastest and Mr hennessy was the slowest
Step-by-step explanation:
3/4 of an hour is 45 minutes Mr panasuk took 45 minutes
Answer:
12
Step-by-step explanation:
we use Pythagoras law
√13^2-5^2
Answer:
=-5
Step-by-step explanation:
16=-3x+1
Subtract 1 from both sides
15=-3x
Divide both sides by -3 to isolate x
x=-5
