Toñito, tiene dos recipientes con mezclas de alcohol y agua. En el primero hay “a" litros de de alcohol y “b" litros de agua; en el segundo hay “b" litros de alcohol y “a" litros de agua. Si se intercambian “b" litros del primero con “a" litros del segundo simultáneamente. ¿Cuantos litros de alcohol hay ahora en el primer recipiente? ​

Astudent observes a star from two positions of earth in its orbit, in summer and winter, and measures the change in the position of the star. which of these can be best calculated by this method?

Chinese privet is a plant that is native to china. over 150 years ago, chinese privet was introduced to the united states as a fast-growing shrub that serves as an excellent privacy hedge. with no natural herbivore, chinese privet quickly established itself and spread in natural areas throughout the southeast and eastern seaboard of the united states. its dominance in these areas has jeopardized the survival of native plant species. chinese privet provides evidence that introducing non-native organisms can cause environmental damage integrated pest management strategies will not decrease chinese privet populations american gardeners can easily control the spread of chinese privet non-native plant species have type i survivorship curves

Plz ! ive been stuck on this forever