Read this excerpt from a speech by US president Lyndon B. Johnson. Which phrase refers to the origins of American immigrants?
Our beautiful America was built by a nation of strangers. From a hundred different places or more they have poured forth into an empty land,
joining and blending in one mighty and irresistible tide.
The land flourished because it was fed from so many sources-because it was nourished by so many cultures and traditions and peoples.

Answer decreased soil salinity;

In a right-angled triangle: 1- the hypotenuse is the longest side2- we can apply pythagorean rule which states that: (hypotenuse)^2 = (side1)^2 + (side2)^2for the given triangle,longest side is 15 cm  side1 = 9 cmside2 is 12 cm  to check whether the triangle is right-angled or not,compare (15)^2 to the summation of (9)^2 and (12)^in other words, compare 225 to the summation of 81 and 144if they are both equal, then the triangle is right-angles, otherwise, it is not.you haven't provided the diagram showing her work, so i cannot tell the choice. however, apply my explanation to the question you have.