Mr. mcdonald wants his students to ask him for on their geometry problems only after they have tried to solve the problems independently for at least five minutes. mr. mcdonald should reinforce students’ -seeking behavior on a schedule.

differential rate of low responding

Explanation:

Differential rate of low responding is a term widely used in educational environments to stimulate students' problem-solving skills. This term refers to the situation where the educator displays a challenge and establishes a positive stimulus that will be delivered after a period of time. An example of this is what Mr. McDonald is doing with his class of students, as he has established that he will help students who cannot solve their geometry problems after they try to solve it for at least 5 minutes.

the above statement/question is (true);

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals