Which ratio correctly compares 30 in. to 2 ft, when the lengths are written using the same units?
note: 12 in. = 1 ft
a. 1: 15
b. 5: 45
c. 4: 5
d. 15: 1

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

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?

Which of the following is true for the relation f(x)=2x^2+1