Paul bought a soft and a sandwich for $9.90. what equation may be used to find the price of each item if the sandwhich cost 3.5 times as much as the soft drink

Ihave this math question 2/3 ÷2 1/10=

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?

What is always true about a positive integer raised to a negative odd power?