IM GIVING 20 POINTS. help me please. it would be very helpful

Fractions can be added and subtracted only if they're fractions. a. like b. proper c. improper d. unlike

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?