Insert grouping symbols to make it true

3 + 8 - 2 x 5 = 45

If a • b*2 = 1.8 x 10*-7, and c•b/d = 7.2 x 10*-4, find the value of a•d*2/c*2

To which set of numbers does the number –5 belong? select all that apply. integers natural numbers rational numbers real numbers whole numbers

How do you do the foil method with polynomials?