let x = the price of a book
so you would have
total = 3x-20
Answer:
Step-by-step explanation:
Every Triangle has three altitudes. These are lines the go from an angle's point of the two lines meeting. The altitude goes from the the point of meeting to the side opposite. The altitude and the side opposite meet at right angles.
There are three such altitudes. They always have 1 point where they meet.
That meeting place is called the orthocenter.
This is showing how to do it
7x+3x=280
10x=280
x=28
John 7*28= 196$
Peter 3*28=84$
Use the distance formula.
The distance, d, between points
and
is given by the distance formula below.
Now we can apply the formula to your points.
Let Point 1 be (2, 3) and Point 2 be (5, -4).
Then you have
Answer: the distance is sqrt(58)