you want to know many ways that 5 out of 10 people can be lined up. Is this scenario a combination or a permutation?

Tabby sells clothing at a retail store, and she earns a commission of 6.25% on all items she sells. last week she sold a pair of jeans for $32.50, a skirt for $18.95, and 2 blouses for $14.95 each. what was tabby's total commission? a $4.15 b $5.08 c $81.35 d $348.60

Which of the following is an equation of a line parallel to the equation y=4x+1?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.