Answer:
The equation is given below as

Step 1:
We will work on the left-hand side, we will have

By substituting the identity above, we will have

Here, we will make use of the quotient identity
Step 2:
By writings an expression, we will have

Here, we will use the definition of subtraction

Step 3:
We will apply the double number identity given below

By applying this, we will have

Here, we will use the double number identity
If you start on page 20 and end on Page 50, you will have read 31 pages. I just counted from 20 to 50, including the number 20 in it.
OR: You already know there are 50-20=30 pages. But that's without counting the 20 in it. So when you add the extra 20: 30 + 1 = 31
Translated version:
Если вы начнете со страницы 20 и закончите со страницы 50, вы прочтете 31 страницу. Я только что насчитал от 20 до 50, включая число 20 в нем.
ИЛИ: Вы уже знаете, что 50-20 = 30 страниц. Но это без учета 20 в нем. Поэтому, когда вы добавляете дополнительные 20: 30 + 1 = 31
Я использовал Google Translate, поэтому результаты могут быть неточными.
Not 100% sure this is correct but this seems correct.
Answer:
36+9x=99
x=7
Step-by-step explanation:
36+9x=99
Subtract 99 and 36:
63
9x=63
Divide:
x=7
The line of symmetry.
It divides the parabola into to halves that are exactly the same.