Which ratio is equivalent to 7:3

A : 28 : 12
B : 49 : 9
C : 21 : 7
D : 12 : 8

Which of these is and example of a literal equation? a) 6+30=6^2 b)3x-4y c)12=9+3x d)ax-by=k

Thales was an ancient philosopher familiar with similar triangles. one story about him says that he found the height of a pyramid by measuring its shadow and his own shadow at the same time. if the person is 5-ft tall, what is the height of the pyramid in the drawing?

Select the two pairs of figures that are similar.