Answer:
(cx)2-(dy) 2
Step-by-step explanation:
Formula a2-b2= (a+b) (a-b)
By given formula
(cx)2 - (dy) 2 = (cx+dy) (cx-dy)
I believe you need to solve this using the quadratic formula!
To begin, this is what it is:
x= -b ± <span>√ b^2 - 4ac / 2a
Just plug in what you have in your problem...
2 being a, 13 being b, and -24 being c.
So we get:
x= -13 </span>± <span>√13^2 - 4(2)(-24) / 2(2)
x= -13 </span><span>± √169 - 8 (-24) / 4</span>
<span>x= -13 <span>± √169 + 192 / 4</span>
x= -13 </span>± √<span>361 / 4
The square root of 361 is 19.
So you have: -13 </span><span>± 19 / 4.
Here's where you take the equation </span>-13 <span>± 19 and put the addition and subtraction sign to use.
-13 - 19 = -32
and
-13 + 19 = 6
Now all is left to do is divide the two numbers by 4.
-32/4 = -8
and
6/4 = 3/2
x = -8, 3/2</span>
You would move 4 to the left and 3 up
X + 5 + 4 + x + 5 = 60
2x + 14 = 60
-14 -14
2x = 46
x = 23
So, Josh's age is 23 + 4 which is 27 years old.
Answer:
Step-by-step explanation:
simple if 168 = 75% then you do 168/75 = 2.24 then you do 2.24 multiply by 100 = 224. There is 224 students in the school.
To check my answer do 168/224 and it is 0.75 which is 75%
hope this helps:)
