Which equation is quadratic in form?
a. 6(x + 2)^2 + 8x + 2 + 1 = 0
b. 6x^4 + 7x^2 – 3 = 0
c. 5x^6 + x^4 + 12 = 0
d. x^9 + x^3 – 10 = 0

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?

Candy lives in the center of town. her friend darlene lives 28 miles to the east and her friend dana lives 21 miles north. approximately how far do dana and darline live apart ?

As voters exit the polls, you ask a representative random sample of voters if they voted for a proposition. if the true percentage of voters who vote for the proposition is 63%, what is the probability that, in your sample, exactly 5 do not voted for the proposition before 2 voted for the proposition? the probability is