Answer:
4 or -4
if that's not a choice negative or positive 4 to the power of2
(1) The integral is straightforward; <em>x</em> ranges between two constants, and <em>y</em> ranges between two functions of <em>x</em> that don't intersect.

(2) First find where the two curves intersect:
<em>y</em> ² - 4 = -3<em>y</em>
<em>y</em> ² + 3<em>y</em> - 4 = 0
(<em>y</em> + 4) (<em>y</em> - 1) = 0
<em>y</em> = -4, <em>y</em> = 1 → <em>x</em> = 12, <em>x</em> = -3
That is, they intersect at the points (-3, 1) and (12, -4). Since <em>x</em> ranges between two explicit functions of <em>y</em>, you can capture the area with one integral if you integrate with respect to <em>x</em> first:

(3) No special tricks here, <em>x</em> is again bounded between two constants and <em>y</em> between two explicit functions of <em>x</em>.

Answer:
security/protection
Explanation:
The main purpose of a data encryption algorithm is security/protection. These algorithms grab data and change it into indecipherable code. This code can only be decrypted using a key that has been uniquely created for that exact piece of data. Usually, when the encrypted data and key have been created the key is given to the select few that need to have access to the data. This process helps protect the data from being seen or manipulated by unwanted parties.
They add different things to the car so that they can make the cars faster so they can go onto the market they also make the car more expensive so they can make more money. Don't know if that helps but there.