Plz help me! Name the similar triangles.

ΔABC ~ ΔDEF
ΔABC ~ ΔEFD
ΔABC ~ ΔDFE
ΔABC ~ ΔFED

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

What is the solution set of the quadratic inequality x^2-5< or equal to 0

15/16 as a decimal rounded to the nearest hundredth