3.5x=42
x represents the length, since the formula to find area of a rectangle is width times length.
90 degree rotation clockwise : (a,b) --> (b,-a)
so... (24,-15) --> (-15,-24) is a 90 degree clockwise rotation
He can read 
chapters of his history book in 1 hour.
<em><u>Explanation</u></em>
Franco read 3/8 of a chapter of his history book in 1/5 of an hour.
Suppose, he can read 
chapters of his book in 1 hour at this rate.
So, the equation according to the <u>ratio of 'the chapter to the time'</u> will be....
So, he can read chapters of his history book in 1 hour.
Answer:
He have to invest $527.777778 .
Step-by-step explanation:
X : 4.75% = $10,000 : 90
