Which represents the sample space of flipping a coin two times? What would be the probability of getting 2 heads?

A) HT, TH : 1/2
B) HH, TT, HT, TH: 1/2
C) HH, HT, TT, TH: 1/4
D) HT, TH, TT, TH, HH: 1/5

Mr. walker gave his class the function f(x) = (x + 3)(x + 5). four students made a claim about the function. each student’s claim is below. jeremiah: the y-intercept is at (15, 0). lindsay: the x-intercepts are at (–3, 0) and (5, 0). stephen: the vertex is at (–4, –1). alexis: the midpoint between the x-intercepts is at (4, 0). which student’s claim about the function is correct?

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

I’m still confused on how to work the percentages