How do you do this? I just need an example so I can do the rest on my own. Please and thank u!!

Billie holiday sells children's clothing for sara vaughn's toddler shop. baby blankets sell for $29.99 after a markup rate based on cost of 109%. find the cost and the markup.

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2

Determine the required value of the missing probability to make the distribution a discrete probability distribution. x p(x) 3 0.23 4 ? 5 0.51 6 0.08 p(4) = nothing  (type an integer or a decimal.)