19. Two power lenses, -19 D and +6 D are in contact with each other. What is the focal length of the combination of these lenses?
43522*789
what is the decomposition of 232
|-5+3i -4-2i|
-2x-5x=-8(4x+5)+5(6x-8)
In an auto show, 400 people liked Honda, 300 people liked Toyota, and 150 people liked both
Honda and Toyota. If there were 750 p...
-5+3i-4-2i
(81x^-4 /16y^4)^-3/4
$$\int(ln(x)/x) dx$$
4 painters used 6 days to paint a house. how long will it take 9 painters working at the same house?
