Hm ok, so the answer here would be 9/40
Kinda big right? Heres my reasoning:
To find the answer when the denominators and different, you cross multiply using each of the bottom numbers like this:
Then we subtract 16 from 25 to get 9.
I would like to simplify, but 40 and 9 don't have any common denominators unfortunately.
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Answer:
Mandy will take 67.5 mins to complete the 15 km race.
Step-by-step explanation:
Given:
Mandy runs 4 km in 18 min
She plans to run in a 15 km race.
We need to find how much time required to run 15 km.
4 km =18 min
15 km = time required for 15 km race
By Using Unitary method we get,
Time required for 15 km =
Hence time required by Mandy to complete 15 km race is 67.5 mins.
we have
This is a vertical parabola open upward
The axis of symmetry is equal to the x-coordinate of the vertex
The vertex is the point (h,k)
the equation of the axis of symmetry is
In this problem
so the x-coordinate of the vertex is
<u>Convert the quadratic equation in vertex form</u>
Group terms that contain the same variable, and move the constant to the opposite side of the equation
Factor the leading coefficient
Complete the square. Remember to balance the equation by adding the same constants to each side
Rewrite as perfect squares
remember that
so
substitute in the equation
therefore
<u>the answer is</u>