They marked 2,9 on the wrong place , they accidentally put it on 9,2
The last one, as the the scale factor is 3. If we divide each side of the first triangle by their corresponding sides, such as (21/7, or 6/2), we get the same result, which is 3. All others are wrong because in the first one we are not giving all sides, and the second one doesn’t have the same scale factor for its sides. Hope this helps.
Is it all? Is there any more information about it?
Answer:
Step-by-step explanation:
1. Let the shorter piece be x in. long
the longer piece will be x + 13 in. long
and the two pieces add up to be 47 in., so
x + ( x + 13 ) = 47
2x = 47 - 13
2x = 34
x = 17
the longer piece is x + 13 in. long,, or 17 + 13 = 30 in. long
2. number of dimes: x
number of quarters: y
x + y = 27....(1)
10x + 25y = 405...(2)
(1)*10: 10x + 10y = 270....(3)
(2) - (3):15y = 135
y = 9
plug y = 9 into (1), you will find that x = 18
so 18 dimes, 9 quarters