9514 1404 393
Answer:
Step-by-step explanation:
If we let x and y represent the costs of a lamp and end table, respectively, the two purchases can be written as ...
3x +2y = 520
2x -y = 20
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These equations can be solved many ways. If we use "elimination", we can add twice the second equation to the first to eliminate y:
(3x +2y) +2(2x -y) = (520) +2(20)
7x = 560 . . . . simplify
x = 80 . . . . . . divide by 7
y = 2x -20 = 2(80) -20 = 140
The cost of a lamp is $80; the cost of an end table is $140.
Answer:
77.
Step-by-step explanation:
an = a1 + (n-1)d where d is the common difference.
a12 = a1 + 11d
22 = a1 +11(-5)
22 = a1 - 55
a1 = 22 + 55
a1 = 77.
Answer:
14 Yards
Step-by-step explanation:
Hiiiiiiiiiiiiiiiiiiiiiiii 27384839-272737=2727278
Answer:
Step-by-step explanation:
If two similar triangles have a scale factor of a : b, then the ratio of their perimeters is a : b
(.perimeter ABC) /( perimeter DEF) = (AB)/(DE)
Example:Triangle(ABC) with perimeter 24 . Find new triangle (DEF) using proportion 9/6
24/perim DEF = 6/9
Cross multiplication
(24*9) = 6*( perimeter of DEF)
216 = 6*(perimeter of DEF
Divide both sides by 6
36 = DEF
Triangule with perimeter 24 (find new perimeter)
The perimeter of the new triangle using proportion 6/9 is 36
