Answer:
C
Step-by-step explanation:
(12 x 2) - 5 because twice as many means to multiply by 2. fewer means to subtract.
-10x - 15y = -30
-10x + 30 = 15y
(30 - 10x) / 15 = y
(30/15) - (10x/15) = y
2 - 2x/3 = y
Answer: y = -2x/3 + 2 or y = 2- 2x/3
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:
84 circular tiles are needed to make pattern number 20
4(20+1)
Step-by-step explanation:The number of circular tiles is 1 more than the pattern number on each side of the square.
circular tiles = 4(n +1)
