Spaceship model kits originally cost d dollars online. You buy each kit on sale for 30% of the original price, plus a shipping fee of $3.50 per kit. After assembly, you sell each model online for (2.5d+5) dollars. What is your profit on each model spaceship sold?

X+y=-4 x-y=2 use elimination with adding and subtraction

With number 11 ( show how you got the answer)

Afootball quarterback has two more chances to throw a touchdown before his team is forced to punt the ball. he misses the receiver on the first throw 25% of the time. when his first throw is incomplete, he misses the receiver on the second throw 15% of the time. what is the probability of not throwing the ball to a receiver on either throw?