PLEASE HELP!! What is the range of the function f(x) = 2x2?

A. 0 < f(x) < ∞
B. 0 ≤ f(x) < ∞
C. 2 ≤ f(x) < ∞
D. −∞ < f(x) < ∞

Scrub a dub toothbrushes are $4.00 each. there is a 10% discount, but there is also a 6% sales tax after the discount is applied. what is the new price after tax? round to the nearest penny

Aline has a slope of and a y-intercept of –2. what is the x-intercept of the line?

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.